Question: How many sequences a 1 , a 2 , a 3 , a 4 , a 5 satisfying a 1 < a 2 < a

How many sequences a1, a2, a3, a4, a5 satisfying a1 < a2 < a3 < a4 < a5 can be formed if each ai must be chosen from the set {1, 2, 3, , 9} ? NEED PROCESS

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