# 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.

1. since the GP has a common ratio,
(a+8d)/(a+4d) = (a+15d)/(a+8d)
(a+8d)^2 = (a+15d)(a+4d)
3a = 4d

posted by Steve

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