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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

A

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

B

`(ab)/(b-a)`

C

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

D

None of these

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MTG IIT JEE FOUNDATION-ARITHMETIC PROGRESSIONS -EXERCISE (MULTIPLE CHOICE QUESTION )(LEVEL 1 )
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  10. The first and last terms of an A.P. are 1 and 11. If the sum of its...

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  16. If a clock strikes once at one O'clock twice at two O'clock ,thrice at...

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  17. The sum of all terms of an arithmetic progression having ten terms exc...

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  18. A man is saves Rs 400 more each year than he did the year before . If ...

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  19. The sum of three terms of an A.P. is 21 and the product of the first a...

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  20. The angles of a quadrilateral are in A.P. whose common difference is 1...

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