Two fair coins are tossed. What is the probability that at least one is a tail? (Enter the probability as a fraction.)

2 heads....has at least one head 1 head, 1 tail...has at least one head 1 tail, 1 head...has at least one head 2 tails...does not have at least one head P(at least one head in two tosses) = 3/4

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