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SAT模拟考试题:SAT数学练习题(18)

2016-08-11 16:59:05来源:网络

  Question 4: If a two-sided coin is flipped 4 times, what is the probability that at least one head will show up?

  Answer: 15/16

  Explanation:

  p1 = the probability that at least one head will show up when the coin is flipped 4 times

  p2 = the probability that no heads will show up when the coin is flipped 4 times

  p1 + p2 = 1

  The probability that no heads will show up when the coin is flipped 4 times =

  the probability that the head will not show up when the coin is flipped the 1st time OR

  the head will not show up when the coin is flipped the 2nd time OR

  the head will not show up when the coin is flipped the 3rd time OR

  the head will not show up when the coin is flipped the 4th time.

  The probability that no heads will show up when the coin is flipped 4 times, p2 = (1/2) ·(1/2) ·(1/2) ·(1/2) = 1/16

  p1 = 1 - p2 = 1 - (1/16) = 15/16

  Question 5: What is the value of (2x + 1 - 2x) / (2x - 2x - 1)?

  Answer: 2

  Explanation: (2x + 1 - 2x) / (2x - 2x - 1) = 2·(2x - 2x - 1) / (2x - 2x - 1) = 2

  Question 6: Side AB of the ABCD square is 10, AE = ED and BF = FC. What is the ratio between the area of parallelogram BFDE and the area of triangle AEB?

SAT模拟考试题:SAT数学练习题(18)

  Answer: 2

  Explanation: The area of triangle AEB A1 = (1/2) · AB · AE = (1/2) · 5 · 10 = 25.

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本文关键字: SAT模拟考试 SAT数学

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