A real estate agent has determined probabilities for two neighboring houses, one of which is a model home. The probability that the model home will be sold is 0.60; the probability that the house next door will be sold is 0.50; and the probability that both houses will be sold is 0.40. Find the probability that at least one of the two houses will be sold.

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A real estate agent has determined probabilities for two neighboring houses, one of which is a model home. The probability that the model home will be sold is 0.60; the probability that the house next door will be sold is 0.50; and the probability that both houses will be sold is 0.40. Find the probability that at least one of the two houses will be sold.