Write the number of ways in which 5 red and 4 white balls can be drawn from a bag containing 10 red and 8 white balls.
Question:

Write the number of ways in which 5 red and 4 white balls can be drawn from a bag containing 10 red and 8 white balls.

Solution:

4 white and 5 red balls are to be selected from 8 white and 10 red balls.

$\therefore$ Required number of ways $={ }^{8} C_{4} \times{ }^{10} C_{5}$