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The letters ABCDEF and numerals 1, 2, 3, 4 , 5, 6 are to be used...

The letters ABCDEF and numerals 1, 2, 3, 4 , 5, 6 are to be used to make passwords of  length 3. How many passwords can be formed if we allow repetitions?

How many passwords can be formed if we do not allow repetitions?

math   Statistics-And-Probability   
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