A teacher wants to select the class monitor in a class of 30 boys and 20 girls................

                                                                        EXERCISE 3.1
Que.1.A teacher wants to select the class monitor ina class of 30 boys and 20 girls .In how many ways can the monitor be selected if the monitor must be a girl?
Answer=   Now teacher wants to select girl monitor
                  therefore ,number of ways of selecting girl monitor is 20.