Let an= 16,4,1,… be a geometric sequence...

Let `a_n= 16,4,1,…` be a geometric sequence .Define `P_n` as the product of the first n terms. The value of `underset(n=1)overset(oo)Sigma nsqrtP_n` is _________.

A

8

B

16

C

32

D

64

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The correct Answer is:

C

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