squre at middle
Level
pending
Find sum of
1.2².3+2.3²4+3.4².5+……………… Up to n=10
The answer is 39468.
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1 solution
The formula for Ten is n(n+1)²(n+2) Then split n+1 to n+3-2 applying Vn method
Tn= n(n+1)(n+2)(n+3)-2n(n+1)(n+2)
Vn=n(n+1)(n+2)(n+3)(n+4)-2n(n+1)(n+2)(n+3)
So Apply vn method to get sum formula and then put n=10 in it