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berikut penjelasannya
n( 7 - 1 )! / n = 6
pembuktian
U6 = (n+1)!/n!
U6 = (6+1)!/6!
U6 = 7 ! / 6 !
U6 = 7
= (n+1) (n)! / n!
= (n+1)