Others Maths Puzzle

Find digital sum of N = 5^(1!+2!+3!+4!+……..14!)
a) 8
b) 9
c) 0
d) 7

Read Solution (Total 1)

Digital Sum will be 8.
exponent of five is divisible by 3 but not by 2 so it becomes odd. and when 5 raise to 3 divided by 9 remainder is -1. -1 divided by 9 answer becomes remainder 8.
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