JEE Main 2022 Mathematics question
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 98/25. Then the sum of the first 21 terms of an AP, whose first term is 10 ar, term is and the common difference is 10 , is equal to
Answer: (1)
Solution
a/(1 − r) = 5 and , so , giving and r = (3/. For the AP with first term 10ar and common
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