Hello,

Somehow i dont seem to be able to solve this simple looking series...pls help..

Sum of ..... 1*(3^2) + 2(4^2) + 3(5^2) + 4(6^2) .....upto 15 terms

So, we can write the Tn as n[(n+2)^2] ,

Also

note the following about the series : as the series is 9 , 32 , 75 , 144, 245...

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23 43 69 101

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20 26 32 .....

Please help me get some ideas...

Thanks..