factorial help!!!

i just need help with factorials


I assume you know what a factorial is:
1! = 1
2! = 1x2 = 2
3! = 1x2x3 = 6
N! = 1x2x3x...x(N-1)xN

They occur often in probability theory.

Please ask a more specific question about factorials. I have no idea what else to tell you.


what is the explicit formula for the nth factorial? is there one without n*(n-1)*(n-2) and so forth?


No, drwls is correct; N! = 1*2*3...*N.

However, when using factorials, short-cuts and simplifications will often be present. For example, the formula for counting the number of ways one can deal two cards from a standard 52-card deck is:
52! / 2!(52-2)!

Well, calculating 52! by itself is an onerous task. However, we can simplify. 52!/50! cancels to 51*52, and 2! is simply 1*2=2. So, the answer is 51*52/2 = 1326.

I hope this helps


Why is 0! equal to one? write back asap!!
-concerned student seeking help

  1. 👍 0
  2. 👎 0
  3. 👁 100

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    what is the factorial of a negative number? The factorial function has singularities at the negative integers. You can see this as follows. For integers we define: (n+1)! = (n+1)n! and we put 0! = 1 So, from 0! you can compute 1!

    asked by chris on July 10, 2007
  2. math

    Find the sum of all positive integers m such that 2^m can be expressed as sums of four factorials (of positive integers). Details and assumptions The number n!, read as n factorial, is equal to the product of all positive integers

    asked by anonymous on June 5, 2013
  3. Math

    -5,-3,-1,1,3,5 If a and b are different integers chosen from the list above, how many possible values are there of the product ab? I know the answer is 15 but do I always use factorial method whenever I meet questions that ask for

    asked by Brenda on February 22, 2015
  4. PreCalc

    Simplify the ratio of factorials. (n+2)!/(n-1)!

    asked by B on November 10, 2010
  5. math

    write the following in compact form using factorials a. 38*37*36*35*34*33 b. 14!/19*18*17*16*15

    asked by Nathan on April 27, 2012
  6. Stats HELP PLEASE

    The game of Yahtzee is played with five fair six-sided dice. A turn consists of rolling all five dice, selecting the ones you want to keep, re-rolling the rest, and then doing this one more time, if necessary. You need to match

    asked by CM on October 28, 2009
  7. math

    find the terms and leave the coefficients as factorials: Term with t^5 in (v-t)^17

    asked by Patty on May 21, 2012
  8. math

    find the terms and leave the coefficients as factorials. Term with b^8 in (a + b^2)^10

    asked by Nick on May 7, 2012
  9. Algebra 1

    Can you please check my work and help me with the parts that I don't understand? For each event, choose the most appropriate term and solve the problem. 1. In a sweepstakes with nine hundred entries, the first winner selected

    asked by Caroline on April 27, 2014
  10. math

    WAT IS 12 FACTORIAL

    asked by PAVLEEN on May 1, 2010

More Similar Questions