What is the factorial of 100? (hundred)
What is the factorial of 100? (hundred)
The number 100! (pronounced “one hundred factorial”) is the number you get when you multiply all the whole numbers from 1 to 100.
That is, 100! = 1×2×3×…×99×100.
When this number is calculated and written out in full, how many zeros are on the end?
That is, 100! = 1×2×3×…×99×100.
When this number is calculated and written out in full, how many zeros are on the end?
What is the factorial of 100? (hundred)
100 x 99 x 98 x 97 x 96 x ... = 9.3326215443944E+157
What is factorial?
Definition of factorial
The factorial is a quantity defined for any integer n greater than or equal to 0.
The factorial is the product of all integers less than or equal to n but greater than or equal to 1. The factorial value of 0 is by definition equal to 1. For negative integers, factorials are not defined. The factorial can be seen as the result of multiplying a sequence of descending natural numbers (such as 3 × 2 × 1).
The factorial symbol is the exclamation mark !.
The factorial formula
If n is a natural number greater than or equal to 1, then
n! = n x (n - 1) x (n - 2) x (n - 3) ... 3 x 2 x 1
If n = 0, then n! = 1, by convention.
Example: 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720
Factorials are used in math quite a lot when calculating the number of possible combinations or permutations of something. If you think about shuffling a deck of 52 cards, you can use factorials to calculate how many possible orders there are.
| Factorial Tables Chart 1! to 100! |
|---|
| 1! = 1 |
| 2! = 2 |
| 3! = 6 |
| 4! = 24 |
| 5! = 120 |
| 6! = 720 |
| 7! = 5040 |
| 8! = 40320 |
| 9! = 362880 |
| 10! = 3628800 |
| 11! = 39916800 |
| 12! = 479001600 |
| 13! = 6227020800 |
| 14! = 87178291200 |
| 15! = 1307674368000 |
| 16! = 20922789888000 |
| 17! = 355687428096000 |
| 18! = 6402373705728000 |
| 19! = 121645100408832000 |
| 20! = 2432902008176640000 |
| 21! = 51090942171709440000 |
| 22! = 1124000727777607680000 |
| 23! = 25852016738884976640000 |
| 24! = 620448401733239439360000 |
| 25! = 15511210043330985984000000 |
| 26! = 403291461126605635584000000 |
| 27! = 10888869450418352160768000000 |
| 28! = 304888344611713860501504000000 |
| 29! = 8841761993739701954543616000000 |
| 30! = 265252859812191058636308480000000 |
| 31! = 8222838654177922817725562880000000 |
| 32! = 263130836933693530167218012160000000 |
| 33! = 8683317618811886495518194401280000000 |
| 34! = 295232799039604140847618609643520000000 |
| 35! = 10333147966386144929666651337523200000000 |
| 36! = 371993326789901217467999448150835200000000 |
| 37! = 13763753091226345046315979581580902400000000 |
| 38! = 523022617466601111760007224100074291200000000 |
| 39! = 20397882081197443358640281739902897356800000000 |
| 40! = 815915283247897734345611269596115894272000000000 |
| 41! = 33452526613163807108170062053440751665152000000000 |
| 42! = 1405006117752879898543142606244511569936384000000000 |
| 43! = 60415263063373835637355132068513997507264512000000000 |
| 44! = 2658271574788448768043625811014615890319638528000000000 |
| 45! = 119622220865480194561963161495657715064383733760000000000 |
| 46! = 5502622159812088949850305428800254892961651752960000000000 |
| 47! = 258623241511168180642964355153611979969197632389120000000000 |
| 48! = 12413915592536072670862289047373375038521486354677760000000000 |
| 49! = 608281864034267560872252163321295376887552831379210240000000000 |
| 50! = 30414093201713378043612608166064768844377641568960512000000000000 |
| 51! = 1551118753287382280224243016469303211063259720016986112000000000000 |
| 52! = 80658175170943878571660636856403766975289505440883277824000000000000 |
| 53! = 4274883284060025564298013753389399649690343788366813724672000000000000 |
| 54! = 230843697339241380472092742683027581083278564571807941132288000000000000 |
| 55! = 12696403353658275925965100847566516959580321051449436762275840000000000000 |
| 56! = 710998587804863451854045647463724949736497978881168458687447040000000000000 |
| 57! = 40526919504877216755680601905432322134980384796226602145184481280000000000000 |
| 58! = 2350561331282878571829474910515074683828862318181142924420699914240000000000000 |
| 59! = 138683118545689835737939019720389406345902876772687432540821294940160000000000000 |
| 60! = 8320987112741390144276341183223364380754172606361245952449277696409600000000000000 |
| 61! = 507580213877224798800856812176625227226004528988036003099405939480985600000000000000 |
| 62! = 31469973260387937525653122354950764088012280797258232192163168247821107200000000000000 |
| 63! = 1982608315404440064116146708361898137544773690227268628106279599612729753600000000000000 |
| 64! = 126886932185884164103433389335161480802865516174545192198801894375214704230400000000000000 |
| 65! = 8247650592082470666723170306785496252186258551345437492922123134388955774976000000000000000 |
| 66! = 544344939077443064003729240247842752644293064388798874532860126869671081148416000000000000000 |
| 67! = 36471110918188685288249859096605464427167635314049524593701628500267962436943872000000000000000 |
| 68! = 2480035542436830599600990418569171581047399201355367672371710738018221445712183296000000000000000 |
| 69! = 171122452428141311372468338881272839092270544893520369393648040923257279754140647424000000000000000 |
| 70! = 11978571669969891796072783721689098736458938142546425857555362864628009582789845319680000000000000000 |
| 71! = 850478588567862317521167644239926010288584608120796235886430763388588680378079017697280000000000000000 |
| 72! = 61234458376886086861524070385274672740778091784697328983823014963978384987221689274204160000000000000000 |
| 73! = 4470115461512684340891257138125051110076800700282905015819080092370422104067183317016903680000000000000000 |
| 74! = 330788544151938641225953028221253782145683251820934971170611926835411235700971565459250872320000000000000000 |
| 75! = 24809140811395398091946477116594033660926243886570122837795894512655842677572867409443815424000000000000000000 |
| 76! = 1885494701666050254987932260861146558230394535379329335672487982961844043495537923117729972224000000000000000000 |
| 77! = 145183092028285869634070784086308284983740379224208358846781574688061991349156420080065207861248000000000000000000 |
| 78! = 11324281178206297831457521158732046228731749579488251990048962825668835325234200766245086213177344000000000000000000 |
| 79! = 894618213078297528685144171539831652069808216779571907213868063227837990693501860533361810841010176000000000000000000 |
| 80! = 71569457046263802294811533723186532165584657342365752577109445058227039255480148842668944867280814080000000000000000000 |
| 81! = 5797126020747367985879734231578109105412357244731625958745865049716390179693892056256184534249745940480000000000000000000 |
| 82! = 475364333701284174842138206989404946643813294067993328617160934076743994734899148613007131808479167119360000000000000000000 |
| 83! = 39455239697206586511897471180120610571436503407643446275224357528369751562996629334879591940103770870906880000000000000000000 |
| 84! = 3314240134565353266999387579130131288000666286242049487118846032383059131291716864129885722968716753156177920000000000000000000 |
| 85! = 281710411438055027694947944226061159480056634330574206405101912752560026159795933451040286452340924018275123200000000000000000000 |
| 86! = 24227095383672732381765523203441259715284870552429381750838764496720162249742450276789464634901319465571660595200000000000000000000 |
| 87! = 2107757298379527717213600518699389595229783738061356212322972511214654115727593174080683423236414793504734471782400000000000000000000 |
| 88! = 185482642257398439114796845645546284380220968949399346684421580986889562184028199319100141244804501828416633516851200000000000000000000 |
| 89! = 16507955160908461081216919262453619309839666236496541854913520707833171034378509739399912570787600662729080382999756800000000000000000000 |
| 90! = 1485715964481761497309522733620825737885569961284688766942216863704985393094065876545992131370884059645617234469978112000000000000000000000 |
| 91! = 135200152767840296255166568759495142147586866476906677791741734597153670771559994765685283954750449427751168336768008192000000000000000000000 |
| 92! = 12438414054641307255475324325873553077577991715875414356840239582938137710983519518443046123837041347353107486982656753664000000000000000000000 td> |
| 93! = 1156772507081641574759205162306240436214753229576413535186142281213246807121467315215203289516844845303838996289387078090752000000000000000000000 |
| 94! = 108736615665674308027365285256786601004186803580182872307497374434045199869417927630229109214583415458560865651202385340530688000000000000000000000 |
| 95! = 10329978488239059262599702099394727095397746340117372869212250571234293987594703124871765375385424468563282236864226607350415360000000000000000000000 |
| 96! = 991677934870949689209571401541893801158183648651267795444376054838492222809091499987689476037000748982075094738965754305639874560000000000000000000000 |
| 97! = 96192759682482119853328425949563698712343813919172976158104477319333745612481875498805879175589072651261284189679678167647067832320000000000000000000000 |
| 98! = 9426890448883247745626185743057242473809693764078951663494238777294707070023223798882976159207729119823605850588608460429412647567360000000000000000000000 |
| 99! = 933262154439441526816992388562667004907159682643816214685929638952175999932299156089414639761565182862536979208272237582511852109168640000000000000000000000 |
| 100! = 9.33262154439441e+157 |
TRICK to FIND THE FACTORIAL OF 100 (HUNDRED)
The clever bit here is thinking what numbers when multiplied together will end in a zero.
So the product of what numbers when multiplied ends in a zero:
1. When one of the things being multiplied ends in zero itself
2. A number ending in 5 multiplied by an even number
3. 25, 50 and 75 when multiplied by some of the small numbers available eg (4, 2 and 6) generate an extra zero
Below is tabulated the origin of all the zeros:
| Number | Zeros | Number | Zeros |
| 100 | 2 | 95 | 1 |
| 90 | 1 | 85 | 1 |
| 80 | 1 | 75 | 2 |
| 70 | 1 | 65 | 1 |
| 60 | 1 | 55 | 1 |
| 50 | 2 | 45 | 1 |
| 40 | 1 | 35 | 1 |
| 30 | 1 | 25 | 2 |
| 20 | 1 | 15 | 1 |
| 10 | 1 | 5 | 1 |
Total | 12 | Total | 12 |
So that's it then there are 24 zeros at the end of 100!
Nice post, I also liked your way of presenting and explaining the information.
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