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The maximum possible value of a+b+c+d wi...

The maximum possible value of a+b+c+d will be where (a+b)=c (b+c)=d, (c+d)=a, for every a, b, c, d`in``I^+` :

A

-4

B

0

C

16

D

can't be determined

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The correct Answer is:
D
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