If p, q, r and s are four positive real numbers such that pqrs = 1, what is th

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If p, q, r and s are four positive real numbers such that pqrs = 1, what is the minimum value of (1+p)(1+q)(1+r)(1+s)?___

Options:

Answer: Option A
:

Take p=q=r=s=1.

(1+1)(1+1)(1+1)(1+1) = 16

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