anonymous
  • anonymous
How many integers between 1 and 40 are multiples of 3 or 7? I don't care for the answer, since it already told me. I just need a solution on how to answer these questions.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
if it was me, i would count
anonymous
  • anonymous
But it would take so long. Is there any method you can use to solve these problems?
anonymous
  • anonymous
just make sure not to count 21 twice

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anonymous
  • anonymous
3 goes in to 40 13 times 7 goes in to 40 5 times but it is not 13+5 because you do not want to count 21 twice
anonymous
  • anonymous
Oh, now I understand. I count 21 twice. My bad. Thank you very much!
anonymous
  • anonymous
and i would disagree about it taking a long time, \[3,6,9,12,15,18,21,24,27,30,33,36,39,7,14,28,35\] done
anonymous
  • anonymous
How do I make sure that I don't count any number(s) twice?

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