(a)[3]
Find the probability that, on one Monday, the team includes 1 man and 3 women.
(b)[2]
Each Tuesday, the darts club selects 3 teams of 4. Every team takes part in a competition in a different town. How many different ways are there to choose the teams if there are no restrictions?
(c)[3]
How many different ways are there to choose the teams if every team has to include at least 1 man and at least 1 woman?
(d)[2]
The 7 men are lined up for a photograph. Two of them are brothers, George and Harry. How many different arrangements of the 7 men are there if there are exactly 2 men between George and Harry?