If the sum of n terms of an A.P. is cn(n−1), where c≠0, then the sum of the squares of these terms is?
A
c2n(n+1)2
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B
23c2n(n−1)(2n−1)
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C
2c23n(n+1)(2n+1)
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D
None of these
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Solution
The correct option is A23c2n(n−1)(2n−1) If tr be the rth term of the A.P., then tr=Sr−Sr−1 =cr(r−1)−c(r−1)(r−2) =c(r−1)(r−r+2)=2c(r−1) We have, t21+t22+⋯+t2n=4c2(02+12+22+⋯+(n−1)2) =4c2(n−1)n(2n−1)6 =23c2n(n−1)(2n−1)