Post Closed as "unclear what you're asking" by D.W., David Richerby, vonbrand, Luke Mathieson, frafl
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Induction proof, basedbase case not working but induction step works?

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Induction proof, based case not working but induction step works

$1+3+5+...+(2n+3)=n^2+4n$

For this series using induction proof.

Base case 1,2,3,.. not working. But induction step works well.

Base case is not given in question.