41-52 Counting Permutations These exercises involve counting permutations.
Three-Digit Numbers How many different three-digit whole numbers can be formed by using the digits , , , and if no repetition of digits is allowed?
The number of different three-digit whole numbers formed by using the given digits.
The digits are , , , and and the condition is that there is no repetition of digits.
The number of permutations of distinct objects taken at a time is,
Total number of digits is and repetition is not allowed.
Thus, the number of selecting different three-digit whole numbers from the digits is given as,
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