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let a,b,c,d be real numbers such that modulus of a-b=2,modulus of b-c=3,modulus of c-d=4.what is the sum of all possible values of modulus of a-d?
|a-b+b-c+a+d+c-d|
=|2a-2d|
=2|a-d|
=2 x 9
= 18


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