O 1 10 1 5 1 20 1 40 Probability Permutation Formula n n r A You have 5 pair of flip flops A green pair a red pair a blue pair a whi pair and a black pain If you randomly select 3 pair to take on vacation what is the probability you choose the black white and red flip flops 1 45 O 1 60 of Favorable Outcomes Total Number of Outcomes Combination Formula n n r r nC