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If sum of infinite G.P whose first ter i...

If sum of infinite G.P whose first ter is a common ratio r is 5 and sum of first 5 terms of this G.P is `98/25` then sum of first 21 term of A.P whose first term is `10ar` and common difference is `10ar^2` is k times of 11 term of same A.P then k is

A

21

B

22

C

20

D

19

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