[填空题]
A police department hask88 /x6flm ,vl9v4kdrubx g1;j gb2ip 4 mrx-d,+ rjvi5 4 yj1dddale and 7 female officers. A special group of 5 officers is to be assembled for an undercover operation.+j rjd i4d- vxd,5d1yr 1. Determine how many possible groups can be chosen.
2. Determine how many groups can be formed consisting of 2 males and 3 females.
3. Determine how many groups can be formed consisting of at least one male.
