Question

why 0! = 1 ??????
please answer me

Answer 1

Answer:

Explanation:

0! = 1 ? C (n,k) is the number of combinations you can make of k objects out of a given set of n objects. We see that C (n,0) and C (n,n) should be equal to 1, but they require that 0! be used. C (n,0) = C (n,n) = ---- n!0! So 0! = 1 neatly fits what we expect C (n,0) and C (n,n) to be.