2+4+6+........ +2n=n(n+1) – InterviewSolution

1.

2+4+6+........ +2n=n(n+1)

Answer»

2+4+6+.....+2n

=2(1+2+...+n)=2*n(n+1)/2=n(n+1)

Hence Proved

method of induction

Discussion

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