Question

A box contains 4 white, 2 blue and 3 red balls. The number of ways in which 2 balls can be drawn from the box so that at least one ball is blue, is (when balls are different)?​

Answer 1

Step-by-step explanation:

Given :-A box contains 4 white, 2 blue and 3 red balls.

To Find:-The number of ways in which 2 balls can be drawn from the box so that at least one ball is blue,

Solution :--

$\color{darkcyan} \begin{array}{l} \text{here} \\ \tt = {}^2C_1×{}^7C_1+{}^2C_2 \\ \\ = 2 \times 7 + 1 \\ \\ = 14 + 1 \\ \\ = 15 \end{array}$

Answer 2

Reefer to the attachment