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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