A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

a compnay wants to have 3 digit phone extensions with the 1st digit not being zero. how many phone extensions are possible?

  • This Question is Closed
  1. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this is a straight forward counting principal problem.

  2. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this is a straight forward counting principal problem.

  3. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you have a 3 digit number so that you cannot use 0 on the first digit

  4. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so you multiply the number of digits you are allowed to plug in in each of the slots that you have.

  5. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    in the first digit you are alloewd to plug in 9 numbers from 1 to 9

  6. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    for the second and third, you have all digits, so 10 numers.

  7. Yuki
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    once you multiply all those numbers you have the answer

  8. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.