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IMSO 2025 Mathematics — International Short Answer Question 18

IMSO Maths · IMSO 2025 Mathematics — International Short Answer

Question 18

For any positive integer n, we have $n!=1\times2\times3\times\cdots\times n$. If the last two digits of $1!+2!+3!+4!+\cdots+2025!$ is $\overline{ab}$, what is the value of $\overline{ab}$?