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Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by 4GMAT_Mumbai » Wed Dec 08, 2010 11:34 pm
7 ! = {7 Factorial} = 7 * 6 * 5 * 4 * 3 * 2 * 1

5 ! = 5 * 4 * 3 * 2 * 1

Only exception is that 0! = 1 (not 0)

n ! = n times (n - 1) times (n - 2) ....3 times 2 times 1

n ! = n times [(n-1)!]

Hope this helps. Thanks.
Naveenan Ramachandran
4GMAT, Dadar(W) & Ghatkopar(W), Mumbai
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