Posted by Kaitlyn on Thursday, September 17, 2009 at 8:32pm.
An odd number is less than 160 and has exactly three defferent prime factors. What is the number? Explain your reasoning.
???
AAAH! help!

Math  Reiny, Thursday, September 17, 2009 at 8:56pm
the first few primes are 3,5,7,11,13,...
if we are to take any 3 and multiply, the only combination that is under 160 is
3x5x7 = 105
if we try to include the next prime, the 11, our product will be greater than 160 (3x5x11 = 165)
so 105 it is !
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