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Question

If a > 0, b > 0 and ab = 1, then the least value of the expression (1 + a) (1 + b) is :

A
2
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B
4
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C
1
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D
14
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Solution

The correct option is B 4
If ab is constant, then (a+b) takes minimum value
when a = b
a = b = 1
(1 + a) (1 + b) = (1 + 1)(1 + 1) = 4

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