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darkbbn

  • 3 years ago

If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D? {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21} {3, 6, 9, 12, 15, 18, 21} {3, 6, 9} { }

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  1. Grazes
    • 3 years ago
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    I think it would help if you listed the numbers in set D

  2. Grazes
    • 3 years ago
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    Basically, D={3,6,9,12,15,18,21} You need to find numbers that are in set A AND set D to get C ∩ D

  3. darkbbn
    • 3 years ago
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    Uhh...?

  4. Grazes
    • 3 years ago
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    Do you understand the part about getting the numbers in set D?

  5. darkbbn
    • 3 years ago
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    No

  6. Grazes
    • 3 years ago
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    btw, I meant sets C and D.

  7. Grazes
    • 3 years ago
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    Numbers divisible by 3 from 1-21? 3 is divisible by 3 because it equals a whole number(1). 6/3=2 (Also a whole number). 9/3=3... etc. Better?

  8. darkbbn
    • 3 years ago
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    Yah i understand how to do that but i dont understand how to get the answer :/ Could u walk me throug it

  9. Grazes
    • 3 years ago
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    Sure. Do we agree that D={3,6,9,12,15,18,21}?

  10. darkbbn
    • 3 years ago
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    Yes

  11. Grazes
    • 3 years ago
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    ∩ means intersection which also means that the numbers in that set MUST be in the 2 sets surrounding it.

  12. Grazes
    • 3 years ago
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    It basically means that the numbers in the intersection of the sets must be in BOTH sets.

  13. Grazes
    • 3 years ago
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    So if A={2,4,6,7} and B={3,4,5,6}, A∩B would be {4,6} because 4 and 6 are in both sets A and B

  14. darkbbn
    • 3 years ago
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    Oh ok

  15. Grazes
    • 3 years ago
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    Now that you have both sets, match 'em up and see which numbers are in both. C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} D={3,6,9,12,15,18,21}

  16. darkbbn
    • 3 years ago
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    3,6,9

  17. darkbbn
    • 3 years ago
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    Ohh Ty ^^ Can u help me with another on? please?

  18. Grazes
    • 3 years ago
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    Right. Which means that your answer should look like: A∩B={3,6,9}

  19. Grazes
    • 3 years ago
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    Sure.

  20. darkbbn
    • 3 years ago
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    If A = {vowels in the English alphabet} and B = {consonants in the English alphabet}, what is A B? {all letters in the English alphabet} {a, e, i, o, u} {b, c, d, f, g, h, j, k, l, m, n, p, q, r, s, t, v, w, x, y, z} { }

  21. Grazes
    • 3 years ago
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    List both sets A and B, please. Also, I don't know what the relation between A and B is because you don't have anything in between A and B

  22. darkbbn
    • 3 years ago
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    there is supossed to be a " U" smble between the A and b on the last sentence and it stated A and B

  23. Grazes
    • 3 years ago
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    That's easy, then.The answer is just all the letters of the alphabet. Consonants+vowels=letters of the alphabet.

  24. darkbbn
    • 3 years ago
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    O.o wow didnet think about that lol Thanks

  25. darkbbn
    • 3 years ago
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    Ill be posting a few more u acn help if u want

  26. Grazes
    • 3 years ago
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    This would be a lot easier if OpenStudy made a Apple Application so I could write everything out...

  27. darkbbn
    • 3 years ago
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    They have a draw thingy

  28. Grazes
    • 3 years ago
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    doesn't help. Have you tried it? My drawings always look atrocious.

  29. darkbbn
    • 3 years ago
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    lol ssame do u kno how to to dthis? If A = {0, 1, 2, 3} and B = {…−3, −2, −1}, what is A ∩ B? {…−3, −2, −1, 0, 1, 2, 3, …} {…−3, −2, −1} {0, 1, 2, 3} { }

  30. Grazes
    • 3 years ago
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    {}. Empty set.

  31. Grazes
    • 3 years ago
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    It can also be |dw:1347317896078:dw| Not a circle, btw

  32. darkbbn
    • 3 years ago
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    Ok ty and haha kinda looks like one ;)

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