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If the first, second and last term of an A.P. are `a ,\ b` and `2a` respectively, its sum is `(a b)/(2(b-a))` (b) `(a b)/(b-a)` (c) `(3a b)/(2(b-a))` (d) none of these

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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