which of the following cannot be the sum of n terms of an AP - -a- 3n-2-5n -b- n-2-5n -c- -n-n-1-2n-1-6 -d- n-n-1- -2 - Explain in detail

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which of the ...

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which of the following cannot be the sum of n terms of an AP ? (a) 3n^2+5n (b) n^2+5n (c) \lbrack(n)(n+1)(2n+1)\rbrack/6 (d) n(n+1) /2 . Explain in detail

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The sum of n terms of an AP is 3n² + 5n and then which term of AP is 164.

n

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3 n^{2} + 5 n

16^{t h}

The sum of first n terms fo an AP is $(5 n - n^{2})$ the nth term of the AP is
(a) (5-2n) (b) (6-2n) (c) (2n-5) (d) (2n-6)

3 n^{2} + 5 n

164

3 n^{2} + 5 n

16^{t h}

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