A map of Brunswick County has a scale of 1.5 inches = 5 mile. If the actual Distance from Lawrenceville to Brodnax is 10 miles,
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Minus both sides by 2m
Minus both sides by k
Divided both sides by 7
Minus both sides by k
Divided both sides by 7
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