Factorials

Number Theory Level 2

Find the last 2 digits in the sum

1!+2!+3!+⋯+2017!. 1! + 2! + 3! + \cdots + 2017! .


Notation: !! is the factorial notation. For example, 8!=1×2×3×⋯×88! = 1\times2\times3\times\cdots\times8 .

Christopher Ho by Christopher Ho
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