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Two stores sell a certain product. Store A has 40% of the sales, 4% of which are of defective items, and store B has 60% of the sales, 3% of which are of defective items. The difference in defective...

In a certain state license plates consist of 4 letters (26 letters in the alphabet) followed by 4 numbers (0-9). How many different license plates can be made in which no letter or number appears...

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