Word problem: Laura Long Mountain cycling tour define Permutations and combinations
Laura is training for a week -Long Mountain cycling tour. She has 12 short hilly routes from which to select mid-week rides.
a) How many ways can she choose 4 different rides from list for the first week's training if order matters?
b) How many ways can she choose 4 dissimilar rides if order does not matter? If she has chosen the first weeks rides, how many ways can she choose four more different rides for second week? Suppose that order does not matter.