Most efficient way to do this question?
$25^{37}\cong (mod 55)$
Attempt:
$25^2 \cong 20 (mod55)$
Then I don't know the best way to continue... I know how to brute force it but I'm just curious what the best way is?
I have injection $f \colon A \rightarrow B$ and I want to get bijection. Can I just resting codomain to $f(A)$? I know that every function i...
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