Question

If the ratio of the sums of first n terms of two A.P.'s is (7n + 1) : (4n + 27), find the ratio of their 9th terms.​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

121:95

answer is in attachment

proceed as

Let the 2 APs have a1 and a2 as their first term and d1 and d2 as their common difference

note:-

we are substituting n with 17 so, that it can fit the question as it will result in 2a+16d which gets cancelled to a+8d which is the 9th term