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3 October, 22:21

The first term of an ap is - 2 and the10th term is 16. find its 15th term

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  1. 3 October, 22:55
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    First find the common difference : -

    10th term - fist term = 9 * common difference

    9d = 16 - (-2)

    9d = 18

    d = 2

    so the 15th term

    = a1 + 14d

    = - 2 + 14*2 = 26 (answer)
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