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If the sum of n terms of an A.P., is 3n^...

If the sum of `n` terms of an A.P., is `3n^2+5n` then which of its terms is 164?
a.`26 t h` b. `27 t h` c. `28 t h` d. none of these

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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