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17 October, 12:39

the first, second and fifth term of a linear sequence (A. P) is / are three consecutive terms of an exponential sequence (G. P), if the first term of the linear sequence is 7. Find the common difference.

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  1. 17 October, 14:36
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    Answer: common difference is 14

    Step-by-step explanation:

    a, a+d, a+4d

    7,7+d, 7+4d

    (7+d) / 7 = (7+4d) / (7+d)

    (7+d) (7+d) = 7 (7+4d)

    49+14d+d^2=49+28d

    d^2-14d=0

    d (d-14) = 0

    d=0 or d-14=0

    d=14
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