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If the sum of n terms of an A.P is cn (n...

If the sum of n terms of an A.P is cn (n-1)where `c ne 0` then the sum of the squares of these terms is

A

`c^(2)n^(2)(n+1)^(2)`

B

`(2/3)c^(2)n(n-1) (2n-1)`

C

`((2c^(2))/3)(n)(n+1)(2n+1)`

D

none of these

Text Solution

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The correct Answer is:
B
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FIITJEE-PROGRESSION & SERIES -SOLVED PROBLEMS (OBJECTIVE)
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  14. For the series 2+12+36+80+150+252 +….., the value of lim(n to oo) T/(n...

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  18. Let x(1),x(2),x(3)…..,x(n) be a sequence of integers such that -1 le x...

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