To find the number of ways to arrange the digits 6, 7, 8, and 9, you can calculate the factorial of the number of digits. Since there are 4 unique digits, the number of arrangements is 4! (4 factorial), which equals 4 × 3 × 2 × 1 = 24. Therefore, there are 24 different ways to arrange the digits 6789.
24 ways.
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4! 4 * 3 * 2 = 24 ways ==========
24 Ways, 4 x 3 x 2 x 1 = 24