Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ilovenyc Group Title

Let A = {red, blue} and let B = {3, 4, 5}. Find A X B. A) {red, blue, 3, 4, 5} B) {(red, 3), (red, 4), (red, 5), (blue, 3), (blue, 4), (blue, 5)} C) { } D) {red, blue}

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Relations aren't that hard to get, actually! I suppose you know that all the elements of \[A \times B\] are coordinate pairs, such as \[(a,b)\]. Specifically, \[a\] is an element in \[A\]. I mean, \[a \in A\]. And \[b\] is an element in \[B\]. I mean, \[b \in B\]. When you try to find \[A \times B\] you want to create all the ordered pairs that exist, as long as they satisify what I just said, where\[a \in A\]and\[b\in B\]

    • 2 years ago
  2. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    So pick any element in A.

    • 2 years ago
  3. ilovenyc Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @theEric so the answer is A

    • 2 years ago
  4. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Not quite! When you think of \[AxB\], you have to think a coordinate pair like \[(somethingFromA, somethingFromB)\]

    • 2 years ago
  5. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I meant \[A \times B\], sorry!

    • 2 years ago
  6. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Pick any element in A.

    • 2 years ago
  7. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    Actually, for this multiple choice question, all you need to know is that \[A \times B\] has elements and they are coordinate pairs...

    • 2 years ago
  8. ilovenyc Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @theEric so then whats the answer

    • 2 years ago
  9. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I want you to understand it.

    • 2 years ago
  10. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I'm imposing my view upon you, I know.. But understanding things like this will be essential to understanding things later.

    • 2 years ago
  11. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    I'm willing to walk you through a similar problem.

    • 2 years ago
  12. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    :)

    • 2 years ago
  13. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[(a \in A, b \in B)\] Example:\[(red,3)\]

    • 2 years ago
  14. ilovenyc Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    @theEric okay I did the work, and I came up with B, am i right?

    • 2 years ago
  15. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[red \in A\]and\[3 \in B\]so \[(red,3)\]is one of those ordered pairs in \[A \times B\].

    • 2 years ago
  16. theEric Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    If you understand that last thing I said, you'll know whether you have the answer or not! If you understand "relations" you'll know what set would have to be the relation. Would you like a hand with anything?

    • 2 years ago
    • Attachments:

See more questions >>>

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.