A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected randomwise, proba

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14.Probability

easy

A bag contains $5$ black balls, $4$ white balls and $3$ red balls. If a ball is selected randomwise, the probability that it is a black or red ball is

A

$\frac{1}{3}$

B

$\frac{1}{4}$

C

$\frac{5}{{12}}$

D

$\frac{2}{3}$

Solution

(d) $P$(Black or Red) $ = \frac{{^5{C_1} + {\,^3}{C_1}}}{{^{12}{C_1}}} = \frac{2}{3}$.

Standard 11

Mathematics

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