Difference between revisions of "2007 AIME I Problems/Problem 4"

Revision as of 17:42, 15 March 2007

First you prime factor all of the numbers: $\displaystyle 60=2^2*3*5$ , $\displaystyle 84=2^2*3*7$ , and $\displaystyle 140=2^2*5*7$ . To find out when they are next collinear, you take $\displaystyle \frac{lcm}{gcf}$ , which is $\displaystyle \frac{2^2*3*5*7}{2^2}=\frac{420}{4}=105$

Page

Toolbox

Search

Difference between revisions of "2007 AIME I Problems/Problem 4"

Revision as of 17:42, 15 March 2007