AMC 8 2004 Problem 21
Source:
July 22, 2011
probability
Problem Statement
Spinners A and B are spun. On each spinner, the arrow is equally likely to land on each number. What is the probability that the product of the two spinners' numbers is even?[asy]
defaultpen(linewidth(1));
draw(unitcircle);
draw((1,0)--(-1,0));
draw((0,1)--(0,-1));
draw(shift(3,0)*unitcircle);
draw(shift(3,0)*(origin--dir(90)));
draw(shift(3,0)*(origin--dir(210)));
draw(shift(3,0)*(origin--dir(330)));draw(0.7*dir(200)--0.7*dir(20), linewidth(0.7), EndArrow(7));
draw(shift(3,0)*(0.7*dir(180+65)--0.7*dir(65)), linewidth(0.7), EndArrow(7));label("", (-0.45,0.1), N);
label("", (-0.45,-0.1), S);
label("", (0.45,-0.1), S);
label("", (0.45,0.1), N);label("", shift(3,0)*(-0.25,0.1), NW);
label("", shift(3,0)*(0.25,0.1), NE);
label("", shift(3,0)*(0,-0.3), S);label("", (0,-1), S);
label("", (3,-1), S);
[/asy]