here's a fun question I got a while ago:
What is the smallest number "n" such that:
n /2 is a perfect square
n/3 is a perfect cube
and n/5 is a perfect fifth power?
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OpenStudy (anonymous):
4/2=2
9/3=3
25/5=5
OpenStudy (anonymous):
i think so
OpenStudy (anonymous):
72
OpenStudy (anonymous):
nah
OpenStudy (anonymous):
a multiple of it but
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OpenStudy (anonymous):
a multiple that is diviisable by 5 I think
OpenStudy (anonymous):
but im going to sleep , tired
OpenStudy (anonymous):
are pagal ho gya hai kya
OpenStudy (radar):
O.K. Joe, don't keep us in suspense here too long!
OpenStudy (anonymous):
I found it
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OpenStudy (anonymous):
2^15*3^10*5^36
OpenStudy (anonymous):
28156757354736328125000000000000000
OpenStudy (anonymous):
Sadly, that's the smallest n
OpenStudy (anonymous):
The smallest number is 0.
OpenStudy (anonymous):
Bah, i should have said non-zero n, good job abtrehearn for catching that mistake
Heromiles is the closest, he has the right idea, but the exponent for 5 can be smaller and still work. Here is a pdf of my solution
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OpenStudy (radar):
Thanks joemath(pi) now we can all get back to work lol.