The common ratio of a GP is 3 and the but term is 486 I
![The common ratio of a GP is 3 and the but term is 486 I](/img/relate-questions.png)
| The common ratio of a G.P is 3 and the but term is 486. If the sum of there terms be 728. Find the term
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Right Answer is:
SOLUTION
r = 3
Last term =436=arn−1=a3n−1
Sn=723=a(1−rn)1−r=a(rn−1)r−1
a2(3n−1)
723436=2/a3n−1/a(3n−1)
From here you can find n and hence you can find a.