The probability that a stereo shop sells at least one amplifier on a given day is 75

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The probability that a stereo shop sells at least one amplifier on a given day is 75 ; the probability of selling at least one CD player is .6; and the probability of selling at least one amplifier and at least one CD player is .5.

a. What is the probability that the stereo shop will sell at least one of the two products on a given day?

b. What is the probability that the stereo shop will sell at least one CD player, given that the shop sells at least one amplifier?

c. What is the probability that the stereo shop will sell at least one amplifier, given that the shop sells at least one CD player?

d. What is the probability that the shop sells neither of the products on a given day?

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