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Mathematics 17 Online
OpenStudy (anonymous):

how many positive 3-digit numbers are not divisible by 7? or by 3?

OpenStudy (anonymous):

how many of them are divisible by 3 or 7? and how many 3-digit numbers are there? much easier questions

OpenStudy (anonymous):

they would need to be multiples of 21 right?

OpenStudy (anonymous):

yes, I think you are right

OpenStudy (anonymous):

so if I find that out, how will it help me answer my original question?

OpenStudy (anonymous):

how many 3 digit numbers are there?

OpenStudy (anonymous):

then it's simple subtraction, but do it either way, whichever is easier

OpenStudy (anonymous):

alright thank you!

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