Ask questions and get helpful responses.

probability

Tickets numbered from one to 40 are mixed up and one is drawn.

What is the probability that number is divisible by 3 or 5?
What is the probability that number is divisible by 3 and 5?

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. x: How many multiples of 3 are there in 1-40?
    y: How many multiples of 5?
    z: how many multiples of 15?
    P(x or y) = (x+y-z)/40
    P(x and y) = P(z) = z/40

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    👤
    oobleck
  2. 8/40+13/40-2/40 =19/40

    8/40 numbers divisible by 5
    13/40 numbers divisible by 3
    2/40 overlapping numbers which are 15 and 30

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Still need help? You can ask a new question.