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14.Probability
easy
If $A$ and $B$ are two events such that $P(A) = 0.4$ , $P\,(A + B) = 0.7$ and $P\,(AB) = 0.2,$ then $P\,(B) = $
A
$0.1$
B
$0.3$
C
$0.5$
D
None of these
Solution
(c) Since we have $P(A + B) = P(A) + P(B) – P(AB)$
$ \Rightarrow 0.7 = 0.4 + P(B) – 0.2 \Rightarrow P(B) = 0.5$.
Standard 11
Mathematics