How many numbers of four digits can be formed with the digits 0, 1, 2, 3 (repetition of digits is not allowed?

How many 7-digit numbers can be formed if repetitions are not allowed and the last number cannot be 1?

How many different license plates are possible if each plate consists of 2 letters followed by a 4 digit number? Assuming repetition in the letters or numbers are allowed and any of the 10 digits may be used in each plate of the 4 digit number.

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A four-digit number is formed using the digits 1, 2, 3, 4, 5 and 6 such that no digit can be used more than once. How many distinct four-digit numbers are possible? How many four-digit numbers are possible if the digits can be repeated? please put a solution, so that i can review and understand it. thank u a.

How many four-digit numbers can be made from the digits 1 to 6 if repetition is allowed?