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AB + CD = AAA, where AB and CD are two-digit numbers and AAA is a three digit number; A, B, C, and D are distinct positive integers. In the addition

problem above, what is the value of C?

(A) 1

(B) 3

(C) 7

(D) 9
E) cannot be determined
a=1,b=3, c=9,d=8


The answer is (D) 9 
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