15.6.31 Definition and Properties of Probability

Condition: out of 3 guns, a volley was made on the target. The probability of hitting a target at one shot from the first gun is 0.9, for the second and third, these probabilities are 0.8 and 0.6, respectively. Find the likelihood that: a) only one gun will fall into the target; b) at least one gun will fall into the target.