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प्रश्न
If the ratio of the sum of the first n terms of two A.Ps is (7n + 1) : (4n + 27), then find the ratio of their 9th terms.
उत्तर
Suppose a1, a2 be the first terms and d1, d2 be the common differences of the two given A.Ps.
Then the sums of their n terms are
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