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Probability question?

A target is composed of concentric circles of radius 1 unit, 3 units and 5 units. Max receives 20, 5 or 2 points respectively for hitting the parts of the target as shown in the diagram opposite. Suppose that Max hits the target with probability of 1/2 (give ans as percentage to 1dp)

(a) Calculate the probability of hitting each part of the target in a single shot.

(b) What would be the probability of getting a score of 40 in only 2 shots?

(c) What would be the possibility of scoring exactly 20 in five shots?

Please include explanations along with answers THANKS! :)

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