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Verified answer
S : himpunan semua kej.n(s) = 10
A : kej. terambilnya bola bernomor 2
n(A) = 1
B : kej terambilnya bola bernomor prima
B = 2, 3, 5, 7
n(B) = 4
P(A) = 1/10
P(B) = 4/10
P(A n B)
= P(A) + P(B)
= 1/10 + 4/10
= 5/10
= 1/2