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If the first second and last term of an ...

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

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RD SHARMA ENGLISH-ARITHMETIC PROGRESSIONS-All Questions
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  18. The 10th common term between the A.P.s 3,7,11,15, and 1,6,11,16,.. i...

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