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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 red.
A
$\frac{4}{9}$
B
$\frac{4}{9}$
C
$\frac{4}{9}$
D
$\frac{4}{9}$
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 red discs $=4,$ i.e., $n( A )=4$
Hence $P ( A )=\frac{4}{9}$
Standard 11
Mathematics
