SOLUTION: In calculating combination and permutation, we have to leverage factorials. For example, 5! = 5*4*3*2*1=120, 4! = 4*3*2*1=24, 3! = 3*2*1=6, 2! = 2*1, and 1! = 1. What is 0!? Why?

SOLUTION: In calculating combination and permutation, we have to leverage factorials. For example, 5! = 54321=120, 4! = 4321=24, 3! = 321=6, 2! = 21, and 1! = 1. What is 0!? Why?

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Question 1027056: In calculating combination and permutation, we have to leverage factorials. For example, 5! = 5*4*3*2*1=120, 4! = 4*3*2*1=24, 3! = 3*2*1=6, 2! = 2*1, and 1! = 1. What is 0!? Why?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
0! = 1

There is exactly one way to arrange zero objects.
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