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anonymous

  • one year ago

Came across this problem. I think the answer is 89. 1x6y7 is a 5 digit not divisible by 9. The number of ordered pair (x,y) satisfying this is?

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  1. mathmath333
    • one year ago
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    i m getting 76

  2. anonymous
    • one year ago
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    did you count from the complement and subtract from total?

  3. mathmath333
    • one year ago
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    might be wrong

  4. mathmath333
    • one year ago
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    yep

  5. anonymous
    • one year ago
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    total is 100 right?

  6. mathmath333
    • one year ago
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    wait

  7. mathmath333
    • one year ago
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    yes sry m getting 95

  8. mathmath333
    • one year ago
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    100-5

  9. anonymous
    • one year ago
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    these are the pairs that I got that makes the number divisible by 9 (0,4), (1,3), (2,2), (3,1) , (4,0) (4, 9), (5,8), (6,7), (7,6), (8,5), (9,4)

  10. anonymous
    • one year ago
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    I might under counted

  11. mathmath333
    • one year ago
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    ur answer looks right i didnt count the later x,y pairs

  12. anonymous
    • one year ago
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    oh ok :)

  13. mathmate
    • one year ago
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    @souwing @mathmath333 I have the same 11 ordered pairs that @souwing posted.

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