Difference between revisions of "2007 AMC 10B Problems/Problem 25"
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is an integer? | is an integer? | ||
| − | (A) 4 | + | <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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| − | (B) 6 | ||
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| − | (C) 9 | ||
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| − | (D) 12 | ||
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| − | (E) infinitely many | ||
Revision as of 19:48, 24 July 2011
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?
