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14.Probability
easy
यदि $E$ और $F$ घटनाएँ इस प्रकार हैं कि $P ( E )=\frac{1}{4}, P ( F )=\frac{1}{2}$ और $P ( E$ और $F )=\frac{1}{8},$ तो ज्ञात कीजिए $P ( E$ या $F )$
A
$\frac{5}{8}$
B
$\frac{5}{8}$
C
$\frac{5}{8}$
D
$\frac{5}{8}$
Solution
Here, $P ( E )=\frac{1}{4}$, $P ( F )=\frac{1}{2},$ and $P ( E$ and $F )=\frac{1}{8}$
We know that $P ( E$ and $F )= P ( E )+ P ( F )- P ( E$ and $F )$
$\therefore P(E $ or $F)=\frac{1}{4}+\frac{1}{2}-\frac{1}{8}$ $=\frac{2+4-1}{8}=\frac{5}{8}$
Standard 11
Mathematics