CBSE Class 12-science Answered
sum the following series to n terms 2+5+10+17+26+.................................
Asked by coolameet08 | 14 Feb, 2010, 12:41: PM
Expert Answer
2 + 5 + 10 + 17 + 26 + .... = (12+1) + (22 + 1) + (32+1) + (42+1) + (52+1) + ...
= 12+ 22 + 32 + 42 + 52 + .......(1 + 1 +1 + +1 + + n times)
= [(n(n+1)(2n+1))/6] + [n(n+1)/2]
= n(n+1)(n+2)/3
Regards,
Team,
TopperLearning.
Answered by | 14 Feb, 2010, 02:12: PM
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