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If a, b, c, d are are positive real numb...

If a, b, c, d are are positive real numbers such that a+b+c+d=2, then M=(a+b)(c+d) satisfies the relation is:

A

`0 lt M le 1`

B

`1 le M le 2`

C

`2 le M le 3`

D

`3 le M le 4`

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The correct Answer is:
A
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