If S is the samle space and $\text{P(A)}=\frac{1}{3}, \text{P(B)}$ and $\text{S}=\text{A}\cup\text{B,}$ where A and B are tow mutually exclusive events, then P(A) =
  • A$\frac{1}{4}$
  • B$\frac{1}{2}$
  • C$\frac{3}{4}$
  • D$\frac{3}{8}$
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