Monday, June 18, 2018

divisibility - Show that the number $n$ is divisible by $7$

How can I prove that $n = 8709120$ divisible by $7$?
I have tried a couple methods, but I can't show that. Can somebody please help me?

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analysis - Injection, making bijection

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...