Let the sum of an infinite G.P., whose first term is a and the common ratio is r, be 5 . Let the sum of its first five terms be \frac{98}{25}. Then the sum of the first 21 terms of an AP, whose first term is 10 a r, n^{\text{th }} term is {\a}_{ {\n}} and the common difference is 10 {\ar}^2, is equal to : [27-Jul-2022-Shift-2]

Sequences and Series Part 2

Section: Mathematics

Question : 34 of 100

Marks: +1, -0

Let the sum of an infinite G.P., whose first term is a and the common ratio is r, be 5 . Let the sum of its first five terms be ‌

. Then the sum of the first 21 terms of an AP, whose first term is 10ar,n‌th ‌ term is an and the common difference is 10ar2, is equal to :

[27-Jul-2022-Shift-2]

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