Exam (elaborations)
Math 115 Exam 2
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Answers 1. A fair coin is tossed 7 times. What is the probability that there are exactly 3 heads. ( ) 3 4 1 1 7! 7 6 7,3 2 2 3!4! C ⋅ = = ⋅ 5 4321 ⋅ ⋅ ⋅ ⋅ ⋅ 321 ⋅ ⋅ 4321 ⋅ ⋅ ⋅ ⋅ 7 35 128 1 2 = 2. A person draws two socks at random out of...
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