2007 AMC 10B Problems/Problem 25
Revision as of 16:51, 22 February 2009 by MathDork135 (talk | contribs) (New page: How many pairs of positive integers (a,b) are there such that a and b have no common factors greater than 1 and: <math>\mathrm frac {a}/{b}</math> + <math>\mathrm frac {14b}/{9a}</math> ...)
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
