P(4 before 9) = C(4,2).7.6 6.7.6 1 3024 12 3024 tched. Problem 5.7.8 A permutation of 5 letters is chosen from the 26 (uppercase) letters of the English alphabet. Find the probability of each event. 1. All 5 vowels are chosen. 2. Rappears before S. 3. The 5 letters are in alphabetical order.

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