Sebuah dadu bersisi enam dilempar sekali, hitunglah peluang kejadian munculnya : a. Mata dadu angka genap dan atau mata dadu angka prima. b. Mata dadu angka ≤ 4 atau mata dadu angka ≥ 3
DB45
A) peluang mata genap dan prima n(s) = 6 A= dadu genap (2,4,6) B= dadu prima (2,3,5) A n B = (2) n(A n B) = 1 P (A n B)= n(A n B)/ n(S) = 1/6
b) peluang angka ≤4 atau angka≥ 3 n(s) = 6 A= mata dadu angka≤ 4 = (1,2,3,4} B =mata dadu angka ≥3 = (3,4,5,6} AUB= (1,2,3,4,5,6) n(AUB) = 6
n(s) = 6
A= dadu genap (2,4,6)
B= dadu prima (2,3,5)
A n B = (2)
n(A n B) = 1
P (A n B)= n(A n B)/ n(S) = 1/6
b) peluang angka ≤4 atau angka≥ 3
n(s) = 6
A= mata dadu angka≤ 4 = (1,2,3,4}
B =mata dadu angka ≥3 = (3,4,5,6}
AUB= (1,2,3,4,5,6)
n(AUB) = 6
P(AUB) = n(AUB)/n(S) = 6/6 = 1