SAT数学Problem Solving练习题(8)
- 2017年07月25日13:38 来源:互联网
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Question 8: If a is an integer chosen randomly from the set {3, 4, 5, 9} and b is an integer chosen randomly from the set {3, 8, 12, 15}, what is the probability that a/b is an integer?
(a) .25
(b) .2
(c) .125
(d) .375
(e) .4
Answer: We have 4 possible integers for a and 4 for b, so the number of possible combinations for (a / b) is 16
a/b is an integer only for 2 combinations:
1. a = 3 and b = 3
2. a = 9 and b = 3
The probability that a/b is an integer is 2/16 = 1/8 = .125 and (c) is the correct answer.