Bearing in mind that a whole will be 5/5, so the full pan is 5/5.
Solve for x.
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The attachment is one version of 50 being factored
Assuming that each marble can be picked with equal probability, we notice that there is a total of
marbles, of which 2 are red.
So, the probability of picking a red marble is
In fact, as in any other case of (finite) equidistribution, we used the formula