Others Maths Puzzle

If f(0)=1 and f(n)= f(n-1)*n, find the value of f(4).
a)8 b)2 c)24

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Others Other Question

xx11/v1111=11.if we cancel any 2 lines we get the value. (3*4096+15*256+3*16+3)
How many 1's are there in the binary representation of the result ?