if the number would have been 17 instead of 15 then how to solve
Reply from Admin:
Factorial of any number greater than 4 will always be divisible by 5.
Even if the number was 17, we would still consider one 1! + 2! + 3! + 4! for the remainder as 5!, 6!, ..., 17! will all give remainder 0 when divided by 5.
Hope this helps.
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if the number would have been 17 instead of 15 then how to solve
Factorial of any number greater than 4 will always be divisible by 5.
Even if the number was 17, we would still consider one 1! + 2! + 3! + 4! for the remainder as 5!, 6!, ..., 17! will all give remainder 0 when divided by 5.
Hope this helps.