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Lecture Comments (1)

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Post by Jeffrey Tao on October 26, 2013

This is more of an important point for other viewers than a question. In the case of the crayons, the probability of picking in the AND case is 1/10 x 1/10 ONLY if after one crayon is picked, it is put back into the box before the second pick. Otherwise, if the crayon is left out, the probability is 1/10 x 1/NINE because if the crayon isn't put back after the first draw, then during the second time picking the crayon, there will be only nine crayons, thus it is 1/NINE x 1/10.

Probability on the SAT

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Introduction 0:00
  • How the SAT Tests Probability 0:10
    • Probability Definition
    • Probability of A or B occurring
    • Probability of A and B both occurring
  • Learn by Example: Probability (1) 4:12
  • Learn by Example: Probability (2) 6:07