( 10 3 ) = 120
( 10 9 ) = 10
2 10 = 1024
The outcomes can be 0, 1, 2, 3, 4 or 5 times "head". Therefore there are 6 possibilities.
( 5 2 ) = 10
( 50 20 ) ≈ 4,71 ⋅ 10 13
For each game two participants are selected from 24 and the order is not relevant. So there are ( 24 2 ) = 276 games to be played.
( 14 4 ) = 1001
( 14 2 ) ⋅ ( 12 2 ) = 6006
8 ! = 40320
5 ! ⋅ 3 ! = 720
6 ! ⋅ 2 = 1440
( 8 3 ) ⋅ 5 ! = 6720
6 ⋅ 6 ⋅ 6 = 216
19
( 18 4 ) = 3060
( 9 2 ) ⋅ ( 9 2 ) = 1296
18 ⋅ 17 ⋅ 16 ⋅ 15 = 73440