[MS]All combination of a string
Write a code to find r-combination of a String of length n.
Ex: for String "abcd"
Combinations are:
"" "a" "b" "ab" "c" "ac" "bc" "abc" "d" "ad" "bd" "abd" "cd" "acd" "bcd" "abcd"
Given an integer n, write a function that returns count of trailing zeroes in n!. Examples: Input: n = 5 Output: 1 Factorial of 5 is 20 which has one trailing 0. Input: n = 20 Output: 4 Factorial of 20 is 2432902008176640000 which has 4 trailing zeroes. Input: n = 100 Output: 24
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