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The ratio of the sum of n terms of two a...

The ratio of the sum of n terms of two arithmetic progressions is given by `(2n+3) : (5n -7)`. Find the ratio of their nth terms.

A

`(4n+5) : (10n' +2)`

B

`(4n +1) : (10n' -12)`

C

`(4n-1) : (10n'+ 8)`

D

`(4n -5): (10n'-2)`

Text Solution

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The correct Answer is:
B
(i) Let `a_1 and d_1` be the first term and common difference of the first AP and `a_2, d_2 ` be the corresponding values for the second AP.
(ii) `S_n:S'_(n)` has to be converted in the form of `t_n : t'_(n)`
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