Three hunters whose probabilities of successfully shooting a

Three hunters, whose probabilities of successfully shooting are 0.9,0.8 and 0.7 respectively, fire one shot each. Suppose the deer will die after getting shot at least twice. Then what is the probability that the deer will survive from the three hunters?

Solution

Probability to shot is P(x)=0.9*0.8*0.7=0.504

Probability of survive is 1-0.504=0.496