In this question we have to use trailing of zeros concept

#1

i donot know the logic but was thing of using trailing of zero

#2

Refer this

#3
#4

last test case is showing run time error

#5

Increase MAX to 100000 and then check.

#6

error soved but why max is changed to 100000

#7

Because values like 500! will have alot more digits than 500