So the series is Pk:22+42+62+...+(2k)2=2k(k+1)(2k+1)3
and i have to replace Pk with Pk+1 to prove the series.
I have to show that 2k(k+1)(2k+1)3+[2(k+1)]2=2(k+1)(k+2)(2k+3)3
but I don't know how.
I have injection f:A→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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