Solution of problem N107 probability theory

107. Three riflemen fired at the target. The probability of defeat of the target by the first shooter is 0.7, for the second and third shooters, these probabilities are respectively 0.8 and 0.9. Find the probability that: a) only one of the shooters will hit the target; B) at least two shooters will hit the target; C) all three shooters will hit the target.