Show that 1.2+2.3+..............+n(n+1)=n(n+1)(n+2)/3

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show that 1.2+2.3+..............+n(n+1)=n(n+1)(n+2)/3

Pramod Mishra

Oct. 31, 2018, 5:37 p.m.

Answers!

Davneet Singh

Nov. 2, 2018, 12:54 p.m.

Hello

Please check https://www.teachoo.com/2249/589/Ex-4.1--6---1.2---2.3---3.4---..---n.(n-1)--n(n-1)(n-2)-3/category/Ex-4.1/

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