GMAT Problem of the Week. Issue#36

There are four different digits a < b < c < d. M and N are the least and the greatest positive four-digit integers that can be written using each of these digits exactly password once. If M + N = 10,477, what is the value of b?

 (A) 2
(B) 3

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(C) 4
(D) 5
(E) 6

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