Question: A combination lock opens with the correct four-letter code. Each wheel rotates through the letters A to L. a) How many different four-letter codes are

 A combination lock opens with the correct four-letter code. Each wheel

A combination lock opens with the correct four-letter code. Each wheel rotates through the letters A to L. a) How many different four-letter codes are possible if you can repeat letters? b) What percent of these codes repeat at least one letter? Give your answer to the nearest percent

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