Twenty otherwise identical balls are individually numbered 1-20 and placed inside a bag. Calculate the probabilities of the following events.

a. A random draw of a single ball produces a ball numbered as a multiple of both 3 and 4.

b. A random draw of a single ball produces a ball numbered as either a multiple of 3 or 4.

c. A random draw of five balls produces the particular balls

in any order.

d. A random draw of three balls produces the particular balls

in that order.

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