Two pipes of same length and diameters d and 2d respectively are connected in se

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Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?

Options:

A . less than d

B . between d and 1.5 d

C . between 1.5 d and 2d

D . greater than 2d

Answer: Option A
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