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If the fourth term of GP is 9 and the sixth term is 81.

Find:
1) common ratio.
2) first term

4 answers

ar^3 = 9
ar^5 = 81
divide them:
r^2 = 9
r = ± 3
take the two cases for r, sub into one of the equations to solve for a
(two sets of answers)

I don't see the value of first term of geometric progression

I don’t know

1/3

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