O 1 3 O 1 4 O 1 5 O 1 6 O 1 7 O 1 8 Probability 1 9 Permutation Formula nPr n n r Number of Favorable Outcomes Total Number of Outcomes A basketball team has 9 players Seven players are 13 years old anc 2 players are 12 years old If the starting 5 players is randomly selected find the probability all 5 are 13 years old Combination Formula n nCr n r r