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April 21, 2014

April 21, 2014

Posted by **Thanh** on Friday, April 22, 2011 at 12:00am.

How do I do this?

- Math -
**MathMate**, Friday, April 22, 2011 at 9:10amBasically, let k=1,2,...20 and try to factor all of the 20 cases. See which one factors and divide the factorable cases by 20 to get the probability.

On the other hand, we know than to factor, k must have two factors that add up to 7, such as 1*6,2*5,3*4...

I'll let you work from here.

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