prove the following by using PMI 1×2+2×3+3×4+............+(2n_1)(2n+1)=n(4(n×n)+6n_1)/3

prove the following by using PMI 1×2+2×3+3×4+............+(2n_1)(2n

1.	prove the following by using PMI 1×2+2×3+3×4+............+(2n_1)(2n+1)=n(4(n×n)+6n_1)/3
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