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Find a G.P. for which sum of the firs...

Find a G.P. for which sum of the first two terms is `-" "4` and the fifth term is 4 times the third term.

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Let a be the first term and r be the common ratio of the G.P.
According to the given conditions,
`a_5 = 4 (a_3)`
`ar^4 = 4ar^ 2`
...
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