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Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: find sum to n terms of the sequence 1,3,6,10,15,21,28,...
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[Post New] 24 Nov 2008 20:30:39 IST
   Subject: Re:find sum to n terms of the sequence 1,3,6,10,15,21,28,...
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akki ~~ unlucky forever ~~ (1635)

Olaaa!! Perrrfect answer. 275  [405 rates]
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Sn = 1 + 3 + 6 + 10 + 15 + ....................+ Tn-1 + Tn


Sn =        1 + 3 + 6 + 10 + 15 + ....................+ Tn-1 + Tn


sobtracting both equation


Tn = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8+ ............. n terms






 


 


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  this reply:   15 points  (with 3  Olaaa!! Perrrfect answer.   in 3   votes   )     [?]
 
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