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?

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  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

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