Difference between revisions of "2007 AMC 10B Problems/Problem 25"
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<math> \textbf{(A) }4\qquad\textbf{(B) }6\qquad\textbf{(C) }9\qquad\textbf{(D) }12\qquad\textbf{(E) }\text{infinitely many} </math> | <math> \textbf{(A) }4\qquad\textbf{(B) }6\qquad\textbf{(C) }9\qquad\textbf{(D) }12\qquad\textbf{(E) }\text{infinitely many} </math> | ||
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| + | Answer: <math>(A)</math> | ||
Revision as of 22:27, 8 January 2012
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?
Answer: 
