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Probability that a lobster will choose tunnel

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A lobster is placed in a tank in which it is given the choice of four tunnels (a, b, c, or d) to travel through. At the opposite end of each tunnel is a cage housing 1 of four types of food. The experiment is conducted 7 separate times and the lobster chooses tunnel 'a' in 5 of the 7 trials.

What is the probability that the lobster would have chosen the 'a' tunnel 5 times in 7 trials?

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A lobster is placed in a tank in which it is given the choice of four tunnels (a, b, c, or d) to travel through. At the opposite end of each tunnel is a cage housing 1 of four types of food. The experiment is conducted 7 separate times and the lobster chooses tunnel "a" in 5 of the 7 trials.

What is the probability that the lobster would have chosen the "a" ...

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