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P = n!/k!l!m!
dimana n = banyaknya angka
k, l, m permutasi dgn unsur yang sama
a) P = 6!/4! = (4! x 5 x 6)/4!
= 5 x 6
= 30
b) P = 6!/2!2!
= (2! x 3 x 4 x 5 x 6)/(2! x 2)
= 3 x 2 x 5 x 6
= 180
semoga membantu :)