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n(A) = suka bulu tangkis
n(B) = suka sepak bola
n(AnB) = suka keduanya
C = tidak suka keduanya
N(s) = n(BT) + n(SB) - n(AnB) +C
50 = 25 + 20 -15 + C
C = 50 - 30 = 20
peluang yang terpanggil tidak ikut spk bola atau bulu tangkis
P(x) = n(C)/ N(S) =20/50 = 0,4 =40%