Asked by Seun

In a decreasing gp the sum of the second and third terms is 36 and the difference between these two terms is 18.find a)the first term b)the nth term

Answers

Answered by oobleck
ar + ar^2 = 36
ar - ar^2 = 18
dividing,
r(1+r)/(r(1-r)) = 2
1+r = 2(1-r)
r = 1/3
a = 81
The GP is 81,27,9,3,...
Answered by eniola
please show solution
Answered by Musa
right
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