If nth terms of two A.P.’s are 3n + 8 and 7n + 15, then the ratio of their…

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If nth terms of two A.P.’s are 3n + 8 and 7n + 15, then the ratio of their 12th terms will be

  1. A.

    4 : 9

  2. B.

    7 : 16

  3. C.

    3 : 7

  4. D.

    8 : 15

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