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niikofi12

  • 3 years ago

what duz it mean to say "(a+b) is composite"?

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  1. kirbykirby
    • 3 years ago
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    It just means it is not prime, meaning there is a divisor that is not just 1 and itself

  2. kirbykirby
    • 3 years ago
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    For example, 2, 3, 5, 7, 11 are prime but 4, 6, 15, 21 are composite (2*2=4, 2*3=6, 3*5=15, 7*3=21)

  3. niikofi12
    • 3 years ago
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    thanks! u r d best!

  4. kirbykirby
    • 3 years ago
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    :) np

  5. niikofi12
    • 3 years ago
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    one mor fn...if u hv X={1,2,3,...,10} n aRb( a relates b) such dat (a+b) is composite. wat r the elements of the relation?

  6. niikofi12
    • 3 years ago
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    is it (1,3),(1,5),(1,7),(1,8),...?

  7. niikofi12
    • 3 years ago
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    @kirbykirby?

  8. kirbykirby
    • 3 years ago
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    yes it would be any pair (a,b) such that adding both together "a+b" gives a composite number Although I'm not too sure if the sum can't be greater than 10. I never saw this "Rb" notation. Does it say anywhere that (a+b) belongs to X ?

  9. niikofi12
    • 3 years ago
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    i think so cuz it says "... and R a relation on X defined by aRb:a+b is composite"

  10. niikofi12
    • 3 years ago
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    cuz X is limited on d range 1-10

  11. niikofi12
    • 3 years ago
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    wat do u fnk?

  12. kirbykirby
    • 3 years ago
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    ok then I would think that the sum can't exceed 10 (but I am not 100% sure o_o)

  13. niikofi12
    • 3 years ago
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    me neither. thanks anyway

  14. kirbykirby
    • 3 years ago
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    but fairly certain. Otherwise I think you'd have too many pairs to list lol

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