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Question

If fifth term of a G.P. is 4, then product of first nine terms is


A

94

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B

418

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C

49

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D

184

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Solution

The correct option is C

49


ar4 = 4 ....................................(1)

Product of first nine terms
= a .ar. ar2 .............ar8

= a9r1+2+................+8
= a9r36
= (ar4)9

= 49


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