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Banyak susunan
= 10! / 3! (10-3)!
= 10 × 9 × 8 × 7! / 3! 7!
= 10 × 9 × 8 / 3 × 2 × 1
= 10 × 3 × 4
= 120 susunan
Semoga berguna +_+