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The 4th term of a G.P. is square of its ...

The 4th term of a G.P. is square of its second term and the first term is -3. Find its 7th term.

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Let r be the common ratio of the given G.P.
Then,` a_4=(a_2)^2`
[given] Now,` ar^3=a^2r^2`
...
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