Number with n, mod 100.

Hello teacher~

n is a double digits.

Find all n such that n^2 = n (mod 100).

Namely, square of n ==> ten's place and one's place is equal to n.

Answer : n = 25, 76. (Namely, 25^2 = 625, 76^2 = 5776)

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How do you think about it ?


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