1.Two horses AAnd B run a race .If the probability of A win is twice that of B,then the probability of B wins
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let p(B)=x
therefore p(A)=2x
then p(not win of B)=1-p(B)
2x=1-x
3x=1
x=1/3
therefore p(A)=2x
then p(not win of B)=1-p(B)
2x=1-x
3x=1
x=1/3
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