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  4. If the third term of a G.P. is 9 . Then the product of its first five terms is

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Q. If the third term of a $G.P.$ is $9$ . Then the product of its first five terms is

Solution:

By data, $a r^{2}=9$.
The product of the five terms $=\left(a r^{2}\right)^{5}=3^{10}$