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anonymous

  • one year ago

Which of the following sets is closed under multiplication? A. {0, 1} B. {1, 2} C. {0, 1, 2} D. None of the sets are closed under multiplication.

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  1. CBARREDO1
    • one year ago
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    I'm not sure, but I think D

  2. jim_thompson5910
    • one year ago
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    |dw:1438040396556:dw|

  3. jim_thompson5910
    • one year ago
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    |dw:1438040463508:dw|

  4. jim_thompson5910
    • one year ago
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    This is a multiplication table for choice D |dw:1438040486835:dw|

  5. jim_thompson5910
    • one year ago
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    do you see any values in the table that aren't part of the original set from choice D?

  6. anonymous
    • one year ago
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    000 024

  7. jim_thompson5910
    • one year ago
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    sorry not D, but C. I misread

  8. anonymous
    • one year ago
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    so its B

  9. jim_thompson5910
    • one year ago
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    |dw:1438040574380:dw|

  10. CBARREDO1
    • one year ago
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    Then D, I was right

  11. jim_thompson5910
    • one year ago
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    so {0,1,2} is NOT closed under multiplication. The goal is to multiply every element with either another value or itself to see if you get some number in the original set. If so, then the set is closed.

  12. jim_thompson5910
    • one year ago
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    check the others first

  13. jim_thompson5910
    • one year ago
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    make a multiplication table like I did

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