1. 5 x 7 x 6 x 5 = 1.050 cara
2. 3 x 2 x 1 = 6 cara
3. 7! - 5 ! = 7 x 6 x 5 x 4 x 3 x 2 x 1 - 5 x 4 x 3 x 2 x 1 = 5.040 - 120 = 4.920
4. 5! x 6 x 7 = 7!
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9. 4 x 2 = 8
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