Maths

The 5th,9th and 16th terms of a linear sequence A.P are consecutive terms of an exponential sequence.Find the common difference of the linear sequence in terms of the first term.

asked by Ande
  1. since the GP has a common ratio,
    (a+8d)/(a+4d) = (a+15d)/(a+8d)
    (a+8d)^2 = (a+15d)(a+4d)
    a^2+16ad+64d^2 = a^2+19ad+60d^2
    3ad=4d^2
    3a = 4d

    posted by Steve

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