English
Hindi
14.Probability
hard

ધારો કે, $A, B, C$ એ  $3$ નિરપેક્ષ ઘટનાઓ એવી છે કે જેથી $P(A)\,\, = \,\,\frac{1}{3}\,,\,\,P(B)\,\, = \,\,\frac{1}{2}\,,\,\,P(C)\,\, = \,\,\frac{1}{4}\,.$ $3$ ઘટનાઓ પૈકી ચોક્કસ $2$ ઘટનાઓ બનવાની સંભાવના શોધો.

A

$1/4$

B

$2/3$

C

$3/2$

D

$1/2$

Solution

$P(A, B, C$ પૈકી ચોક્કસ બે બને $)$

= $P(B \cap  C) + P(C \cap  A) + P(A \cap  B) – 3P (A\cap  B \cap  C)$

=$ P(B).P(C) + P(C).P(A) + P(A).P(B) – 3P(A).P(B).P(C)$

$ = \,\,\frac{1}{2}.\frac{1}{4}\,\, + \,\,\frac{1}{4}.\frac{1}{3}\,\, + \,\,\frac{1}{3}.\frac{1}{2}\,\, – \,\,3.\frac{1}{3}.\,\frac{1}{2}.\frac{1}{4}\,\, = \,\,\frac{1}{4}$

Standard 11
Mathematics

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