- Home
- Standard 11
- Mathematics
14.Probability
easy
A bag contains $9$ discs of which $4$ are red, $3$ are blue and $2$ are yellow. The discs are similar in shape and size. A disc is drawn at random from the bag. Calculate the probability that it will be blue
A
$\frac{1}{3}$
B
$\frac{1}{3}$
C
$\frac{1}{3}$
D
$\frac{1}{3}$
Solution
There are $9$ discs in all so the total number of possible outcomes is $9 .$
Let the events $A, \,B, \,C$ be defined as
$A:$ 'the disc drawn is red'
$B:$ 'the disc drawn is yellow'
$C:$ 'the disc drawn is blue'.
The number of blue discs $=3,$ i.e., $n(C)=3$
Therefore, $P(C)=\frac{3}{9}=\frac{1}{3}$
Standard 11
Mathematics
