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If the ratio of the sums of the n elemen...

If the ratio of the sums of the `n` elements of two arithmetic progressions is `5 n+4: 9 n+16,` then the ratio of their `18^(th)` elements.

A

a.`(180)/(332)`

B

b.`(178)/(330)`

C

c.`(179)/(331)`

D

d.`(181)/(333)`

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The correct Answer is:
C
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