Question

I want to know tha sum of factorial of anu numbers.
1!=1
2!=4
3!=6
4!=24=2+4=6
5!=120=1+2+0=3
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100!=648
Isthere any short cut process to say quickly the sum of digits of any factorial ???

Answer 1

2! = 2, not 4

Answer 2

But I'm not aware of any simple process for summing the digits of a factorial.