They aren't
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There is no medical evidence that a black person will produce more semen than a white person or any other race for that matter. The amount of semen produced depends on many factors including how hydrated the person is, how much physical stimulation he has had and for how long, anatomical factors, etc. It is also a myth that a black penis is statistically longer or larger than a white mans penis. Multiple large surveys show that black vs. white penis size is almost identical.</P>
1/6. There are 6 possible combinations of 2 you could pull out of the washer (red&black, red&white, red&gray, black&white, black&gray, white&gray), and red and black is one of them.
3/6 * 3/5 = 6/30 or 1/5 so you have a 20% chance of pulling a white and then black marble.
50%
It is (4/8)*(6/8) = 3/8