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The first and last terms of an A.P. ar...

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be
(a) 5          (b) 6          (c) 7          (d) 8

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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  20. The common difference of an A.P., the sum of whose n terms is Sn , i...

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