If \[P\,(A)=0.4,\,\,P\,(B)=x,\,\,P\,(A\cup B)=0.7\] and the events A and B are mutually exclusive, then \[x=\] [MP PET 1992]

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1.	If \[P\,(A)=0.4,\,\,P\,(B)=x,\,\,P\,(A\cup B)=0.7\] and the events A and B are mutually exclusive, then \[x=\] [MP PET 1992]
A.	\[\frac{3}{10}\]
B.	\[\frac{1}{2}\]
C.	\[\frac{2}{5}\]
D.	\[\frac{1}{5}\]
Answer» B. \[\frac{1}{2}\]

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If \[P\,(A)=0.4,\,\,P\,(B)=x,\,\,P\,(A\cup B)=0.7\] and the events A and B are mutually exclusive, then \[x=\] [MP PET 1992]

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