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14.Probability
medium
$A$ और $B$ दो घटनाएँ इस प्रकार हैं कि $P ( A )=0.54, P ( B )=0.69$ और $P ( A \cap B )=0.35 .$
ज्ञात कीजिए
$P \left( B \cap A ^{\prime}\right)$
A
$0.34$
B
$0.34$
C
$0.34$
D
$0.34$
Solution
It is given that $P ( A )=0.54$, $P ( B )=0.69$, $P (A \cap B)=0.35$
We know that
$n\left( B \cap A ^{\prime}\right)=n( B )-n( A \cap B )$
$\Rightarrow \frac{n\left( B \cap A ^{\prime}\right)}{n( S )}$ $=\frac{n( B )}{n( S )}-\frac{n( A \cap B )}{n( S )}$
$\therefore P \left( B \cap A ^{\prime}\right)= P ( B )- P ( A \cap B )$
$\therefore P \left( B \cap A ^{\prime}\right)=0.69-0.35=0.34$
Standard 11
Mathematics
