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soal yang tersedia 10-4 = 6 soal
6C4 = 6! / 4!(6!-2!) = 6x5 / 2 = 15
40. yang habis dibagi 5 ada 7 yaitu (1,4) (4,1) (2,3) (3,2) (5,5) (4,6) (6,4)
ruang sampel = 36
peluang = n(a)/n(s) = 7/36