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50 = 25 + 30 + 15 - n(keduanya)
n(keduanya) = 70 - 50
n(keduanya) = 20
a) P(keduanya) = 20/50 = 2/5
b) senang basket tetapi tidak senang voly = hanya suka basket = 25 - 20 = 5
P(hanya basket) = 5/50 = 1/10
c) senang volly tetapi tidak senang basket = hanya suka volly = 30 - 20 = 10
P(hanya volly) = 10/50 = 1/5
semoga membantu ya :)