2+6+12+....+n(n+1)=n(n+1)(n+2)/3
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Answer:
2+6+ ...+n(n+1)
= ∑ n(n+1)
= ∑n^2 +n
=[n(n+2)(2n+1)/6 ] + n(n+1)/2
on simplifying
=n(n+1)(n+2)/3
Step-by-step explanation:
philliepasaumaibulu:
THAT IS A MATHEMATICAL INDUCTION QUESTION.
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