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In: Statistics and Probability

How many ways can a person toss a coin 9 times so that the number of...

How many ways can a person toss a coin 9 times so that the number of tails is between 5 and 7 inclusive?

Solutions

Expert Solution

Number of tails is between 5 and 7 = number of tails is 5 + number of tails is 6 + number of tails is 7

                                                        = 9C5 + 9C6 + 9C7

                                                        = [9! / (5! * 4!)] + [9! / (6! * 3!)] + [9! / (7! * 2!)]

                                                        = 126 + 84 + 36

                                                        = 246 (ans)

orchestra answered 2 years ago
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