There is a 1/3 chance the coin will land heads up and the cube will be a multiple of 3 so first things first a coin is either tails or heads meaning there is two options for the coins per cube number a cube has 6 sides a multiple of 3 is either 3 or 6 meaning you do 2 time 6 because there is two options for the coin toss and there is 6 cube sides that is 12 then what you do is do 2×2 (coin options times how many multiples of 3 there is) which is 4 you then get a final answer of 4/12 or 1/3 simplified