2007 AMC 10B Problems/Problem 25
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How many pairs of positive integers (a,b) are there such that a and b have no common factors greater than 1 and:
+ 
is an integer?
(A) 4
(B) 6
(C) 9
(D) 12
(E) infinitely many
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How many pairs of positive integers (a,b) are there such that a and b have no common factors greater than 1 and:
+
is an integer?
(A) 4
(B) 6
(C) 9
(D) 12
(E) infinitely many
