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Jeanie is a bit forgetful, and if she doesn't make a to do list, the probability that she forgets something she is supposed to do

Jeanie is a bit forgetful, and if she doesn't make a "to do" list, the probability that she forgets something she is supposed to do is0.4. Tomorrow she intends to run three errands, and she fails to write them on her list.

(a)

What is the probability that Jeanie forgets all three errands?

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