We are given with a number of marbles in different colors. The sample space includes all the marbles inside the bag, hence tehere are 16 marbles. The probability of getting a red or blue marble is the sum of probability of getting a red marble alone and that of a blue marble alone. Hence the answer is (6+4)/16 equal to 5/8
It doesn't matter what's between it as long as it is within that range, if that makes any sense.
1.25 isn't.
1.75 isn't.
1.83 isn't.
1.625 would be your answer. :)
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