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Given that 0 < a < b < c < d, which of the following the largest ?

(c+d) / (a+b)
(a+d) / (b+c)
(b+c) / (a+d)
(b+d) / (a+c)
Explanation:

Take a = 1, b = 2, c = 3, d = 4. option A is clearly true.

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