The digit in the unit's place of the number 1! + 2! + 3! + ..... + 99! is

Question

The digit in the unit's place of the number $1! + 2! + 3! + . . . . . + 99!$ is

Smart Achievers · Accepted Answer

(1)

Unit's place digit of the given number

= Unit's place digit of $(1! + 2! + 3! + 4!) + 0$ (As from $5!$ , unit's place digit = 0)

= Unit's place digit of (1 + 2 + 6 + 24)

= Unit's place digit of 33 = 3

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