A)
P = Pa x Pb x Pc /(Pa + Pb + Pc)
B)
P = Pa + Pb + Pc
C)
P = (Pa x Pb / Pc) + (Pb x Pc / Pa) + (Pc x Pa / Pb)
D)
P = [(Pa x Pb) + (Pb x Pc) + (Pc x Pa)] / (Pa + Pb + Pc)

Correct Answer :