Thursday, 10 October 2013

Green plus Red not a Prime

There are 6 red balls and 8 green balls in a bag. Five balls are drawn out at random and placed in a red box. The remaining 9 balls are put in a green box. What is the probability that the number of red balls in the green box plus the number of green balls in the red box is not a prime number?

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Define f:RR by \[f(x)= \begin{cases}(1-\cos x) \sin \left(\frac{1}{x}\right), & x \neq 0 \ 0, ...