(i) Treat 28 as unit: 2×4! = 48; (ii) total 5! − 48 = 72.
Answer: 48; 72
11TH•Mathematics•Permutations And Combinations•Question 10
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Find the number of 5-digit numbers that can be formed from the digits 1, 2, 4, 6, 8 (when no digit is repeated), but
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