Others Maths Puzzle

xx11/v1111=11.if we cancel any 2 lines we get the value.

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Others Other Question

x! ends with k zeros; (x+3)! ends with (k+3) zeros .
0
If f(0)=1 and f(n)= f(n-1)*n, find the value of f(4).
a)8 b)2 c)24