1994 AJHSME Problem 22
Source:
July 9, 2011
probabilitygeometry
Problem Statement
The two wheels shown below are spun and the two resulting numbers are added. The probability that the sum is even is[asy]
draw(circle((0,0),3));
draw(circle((7,0),3));
draw((0,0)--(3,0));
draw((0,-3)--(0,3));
draw((7,3)--(7,0)--(7+3*sqrt(3)/2,-3/2));
draw((7,0)--(7-3*sqrt(3)/2,-3/2));
draw((0,5)--(0,3.5)--(-0.5,4));
draw((0,3.5)--(0.5,4));
draw((7,5)--(7,3.5)--(6.5,4));
draw((7,3.5)--(7.5,4));
label("",(-0.75,0),W);
label("",(0.75,0.75),NE);
label("",(0.75,-0.75),SE);
label("",(6,0.5),NNW);
label("",(7,-1),S);
label("",(8,0.5),NNE);
[/asy]