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Unformatted text preview: Problem 4 The total number of ways of choosing r objects from n objects without replacement when order is not important is (a) C n + r 1 r . (b) n r . (c) C n r . (d) P n r . Problem 5 Consider a random experiment which consists of tossing a fair coin 3 times. If A denotes the event that there are exactly 2 heads, then (a) P ( A ) = 1 8 . (b) P ( A ) = 1 4 . (c) P ( A ) = 5 8 . (d) P ( A ) = 3 8 ....
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- Spring '08