dilempar 2 dadu,peluang muncul angka 7 dan 9

A = muncul dadu jumlah 7
B = muncul dadu jumlah 9
S = ruang sampel

A = {(1,6),(2,5),(3,4),(4,3),(5,2),(6,1)}
n(A) = 6

B = {(3,6),(4,5),(5,4),(6,3)}
n(B) = 4

n(S) = 36

P(A dan B)
= P(A) + P(B)
= n(A)/n(S) + n(B)/n(S)
= 6/36 + 4/36
= 10/36
= 5/18

Semoga bermanfaat...