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If S is a sample space, then P(A) =1/3...

If S is a sample space, then `P(A) =1/3P(B) and S=A uu B` where A and B are two mutually exclusiv then `P(A)=` (A) `1/4` (B) `1/2` (C) `3/4` (D) `3/8`

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Let `P(B) = p`
Then `P(A) = 1/3p`
Since A and B are two mutually exclusive events, we have :
`A∪B=S`
...
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