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Math

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An odd number is less than 160 and has exactly three defferent prime factors. What is the number? Explain your reasoning.
???

AAAH! help!

  • Math - ,

    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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