AJHSME 1991 Problem 22
Source:
June 24, 2011
probabilityPurple Comet
Problem Statement
Each spinner is divided into equal parts. The results obtained from spinning the two spinners are multiplied. What is the probability that this product is an even number?[asy]
draw(circle((0,0),2)); draw(circle((5,0),2));
draw((0,0)--(sqrt(3),1)); draw((0,0)--(-sqrt(3),1)); draw((0,0)--(0,-2));
draw((5,0)--(5+sqrt(3),1)); draw((5,0)--(5-sqrt(3),1)); draw((5,0)--(5,-2));
fill((0,5/3)--(2/3,7/3)--(1/3,7/3)--(1/3,3)--(-1/3,3)--(-1/3,7/3)--(-2/3,7/3)--cycle,black);
fill((5,5/3)--(17/3,7/3)--(16/3,7/3)--(16/3,3)--(14/3,3)--(14/3,7/3)--(13/3,7/3)--cycle,black);
label("",(0,1/2),N); label("",(sqrt(3)/4,-1/4),ESE); label("",(-sqrt(3)/4,-1/4),WSW);
label("",(5,1/2),N); label("",(5+sqrt(3)/4,-1/4),ESE); label("",(5-sqrt(3)/4,-1/4),WSW);
[/asy]