Asked by Olivia
The first thirdd and ninth terms of am AP are the first three terms of a GP. If the seventh term of AP is 14, calculate (a) the 20th term (b) the sum of the first twelve terms of the GP
Answers
Answered by
Steve
just use what you know about AP's and GP's:
(a+2d)/a = (a+8d)/(a+2d)
a+6d = 14
AP: 2,4,6,8,...
GP: 2,6,18,...
Now you can easily find terms and sums.
(a+2d)/a = (a+8d)/(a+2d)
a+6d = 14
AP: 2,4,6,8,...
GP: 2,6,18,...
Now you can easily find terms and sums.
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