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Prove the following by using the princip...

Prove the following by using the principle of mathematical induction for all `n in N` :- `1.2 + 2.3 + 3.4 +... +n.(n+1)=[(n(n+1)(n+2))/3]`

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OMEGA PUBLICATION-SAMPLE QUESTIONS PAPER - 5 (PUNJAB)-Section C
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