Saved Bookmarks
| 1. |
A teacher wants to select the class monitor in a class of 30 boys and 20 girls. In how many ways can the monitor be selected if the monitor must be a girl? |
|
Answer» There are 30 boys and 20 girls. A teacher can select any boy as a class monitor from 30 boys in 30 different ways and he can select any girl as a class monitor from 20 girls in 20 different ways. ∴ by the fundamental principle of addition, the total number of ways a teacher can select a class monitor = 30 + 20 = 50 Hence, there are 50 different ways to select a class monitor. |
|