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

A

`(ab)/(2(b-a))`

B

`(ab)/(b-a)`

C

`(3ab)/(2(b-a))`

D

`(2ab)/(a-b)`

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AAKASH INSTITUTE-SEQUENCES AND SERIES -Assignment (SECTION - A) One option is correct
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