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Question
An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If 4 marbles are picked up at random, what is the probability that at least one of them is blue?
Options:
A .  $$\frac{4}{15}$$
B .  $$\frac{69}{91}$$
C .  $$\frac{11}{15}$$
D .  $$\frac{22}{91}$$
E .  None of these
Answer: Option B

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