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OpenStudy (anonymous):
Show that there are no prime numbers from 200 to 210.
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OpenStudy (anonymous):
Test them...
OpenStudy (anonymous):
But there are prime numbers so what do i do ?
OpenStudy (anonymous):
Well, you can knock out all the even numbers for a start...
OpenStudy (anonymous):
then ?
OpenStudy (anonymous):
If digits of a number sum to a multiple of 3, then then the number is divisible by 3...
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OpenStudy (anonymous):
wait nvm sorry i get it now . LOL
OpenStudy (anonymous):
)
OpenStudy (anonymous):
wait one more question . whats the divisibility rule for 7 ?
OpenStudy (anonymous):
That's a messy one, read it here http://en.wikipedia.org/wiki/Divisibility_rule#Divisibility_by_7
OpenStudy (anonymous):
Thank you
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OpenStudy (anonymous):
ur welcome (might be quicker to just eyeball it for this small set)
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