Lectures - 2.4 Computing Probabilities Using Equally Likely Outcomes

Quiz 2.4 #1

An urn has 7 balls – 4 red and 3 green.
Jimmy picks 3 balls from the urn.
What is the probability that all 3 are red?

  • A. 1/35
  • B. 4/35
  • C. 10/35

Quiz 2.4 #2

You and two other friends are in the “I love finite” club with 10 members.
The 3 of you are running for the club committee, which consists of 4 members.
If the members are chosen at random, what is the probability that at least 2 of you will be elected?

  • A. 21/210
  • B. 42/210
  • C. 70/210