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Posted by on Tuesday, February 1, 2011 at 11:36pm.

Suppose that a natural number from 1 through 9 is selected at random. What is the probabiliy that the number selected is odd if you know that it is prime?

  • mat 157 - , Wednesday, February 2, 2011 at 2:25am

    Please identify the school subject so we know clearly what it is. Mat means nothing to me, but Math does.

    Sra

  • math 157 - , Wednesday, February 2, 2011 at 10:00am

    The only prime numbers in that range are 1, 3, 5 and 7. They are all odd, 100%.

  • math 157 (oops) - , Wednesday, February 2, 2011 at 10:03am

    Sorry, Assuming you count 1 as a prime number, and 9 is not. 4/5 = 80% If you don't count 1, it is 3/5 = 60%.

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