**32 ways**

Dancing- d, singing- s, rapping- r

Skill set as per trainee, 7 possible options as:

1- dsr

2- ds

3- dr

4- sr

5- d

6- s

7- r

Options of 3 trainees with required skill test:

1. dsr+ any 2 others --> 15 ways

2. ds+ 2 others with r included in any --> 4+3+1+1= 9 ways

3. dr+ 2 others with s included in any --> 3+2= 5 ways

4. sr+ 2 others with d included in any --> 2 ways

5. d+s+r --> 1 way

Total- 15+9+5+2+1= **32 ways**