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Let a, a + r and a + 2r be positive real...

Let a, a + r and a + 2r be positive real number such that their product is 64. Then the minimum value of a + 2r is equal to a)4 b)3 c)2 d)`1//2`

A

4

B

3

C

2

D

`1//2`

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The correct Answer is:
A
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