Run error in last two test Cases

#1

I am getting Run error in last two test cases. And my code is also fast. can you please tell me my mistake.

#2

check if there is a division by 0

#3

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#4

It is stilll showing stackoverflow exception for factorial function. How I can resolve that ?

#5

firstly there is no use of big integer in this question .
secondly break the answer into parts i.e. break n! in parts.
in each step multiply the temp ans to the main answer and take mod repeatedly.
so that the answer doesnt exceed out limit.