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If a,b,c,d are positive real numbers suc...

If a,b,c,d are positive real numbers such that `a+b+c +d = 12 ` , then `M = ( a+ b ) ( c + d ) ` satisfies the relation `:`

A

`0 le 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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