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Question

The third term of a G.P. is 4. The product of first five terms is

A
43
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B
45
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C
44
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D
None of these.
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Solution

The correct option is D 45
Let the G.P. be a+ar+ar2+ar3+.......
Then as given
T3=ar2=4.
T1T2T3T4T5=a.ar.ar2.ar3.ar4=a5.r10=(ar2)5=45,

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