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Q1:
63 works.... 21 works too.... 163 and 121 .... ?? Where is the question from? No idea...
Q2:
Lets say we have 3 black marbels and 15 red marbels --> we have 18 marbels.
Col. A: We have 18 marbels, we pick 5. If we took ALL black marbels, there are only red marbels left. So the probability is 1.
Col. B: We have 18 marbels, 3 are black. I would say its 3/18 .... ?
A is bigger.
Are my solutions correct?
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