Question

find the unit digit of 1! + 2! + 3! + 4! + 5! + 6! + …..+ 100!

Answer 1

$\textbf{Answer is in Attachment !}$

Answer 2

1! + 2! + 3! + ... +100!

1 + 2 + 6 + 24 + 120 +...+x

unit digit will be decided by first 4 factorials, because from 5! there will be 5*2 = 10 hence unit digit 0

units digit will be 1 + 2 + 6 + 24 = 33

UNIT DIGIT WILL BE = 3

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