Sequences and Series 3 Question 7
7. If the th and 9 th terms of a non-constant are in GP, then the common ratio of this GP is (2016 Main)
(a)
(b)
(c) 1
(d)
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Answer:
Correct Answer: 7. (d)
Solution:
- Let
be the first term and be the common difference.
Then, we have
i.e.
Now, common ratio,