Berapa banyak permutasi-permutasi berikut ini; A) 5 unsur yang mmuat 3 unsur yang sama B) 10 unsur yang memuat 2 unsur yang sama, 3 unsur lainnya sama, dan 4 unsur lainnya sama
Sarsarasarah
A. 5!/3! = 5×4×3×2×1/3×2×1 = 120/ 6 = 20 B. 10!/2!3!4! = 10×9×8×7×6×5×4×3×2×1/2×1×3×2×1×4×3×2×1 = 3628800/288 = 12600
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lusi13
A. 5!/(5-3)! = 5*4*3*2*1/2*1 = 60 B. 10!/(10-2)! = 10!/8! = 90
B. 10!/2!3!4! = 10×9×8×7×6×5×4×3×2×1/2×1×3×2×1×4×3×2×1 = 3628800/288 = 12600
B. 10!/(10-2)! = 10!/8! = 90