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If the ratio of the sum …

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If the ratio of the sum of n terms of two APs is(7n + 1) : (4n + 27), then the ratio of their 11th terms is.

    • Posted by Lomror ? 4 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Gaurav Seth 4 years, 11 months ago

     4 : 3

    Let Sn and S'n be the sums of n terms of two AP’s and T11  and T11 be the respective 11th terms. Then

    Now put n = 21. We get

    Note: If ratio of sum of n terms of two APs is given in terms of n and ratio of their pth terms is to be found then put n = 2p - 1. Here we put n = 11 x 2 - 1 = 21.

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