Question

There is a red/red sided coing and a yellow/red sided coin. Player A wins if it all red. Player B wins if it is yellow and a red. I know it it fair but why?

Answer 1

Pr(red,red)=1*1/2
pr (red, yellow))=1*1/2

so the odds of red is 1/2, prob of redandyellow is 1/2