The final digit must be a 2 to form an even number. The first digit may be any of three remaining digits (1, 3, 5) while the second digit may be any of the two remaining digits. All together, that makes 3*2 = 6 distinct even numbers.
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36
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
10,000
256
There are 7,290 different 4-digit numbers that can be formed from the digits 1-9 without repetition.
There are 900 three-digit numbers, ranging from 100 to 999.
27 three digit numbers from the digits 3, 5, 7 including repetitions.
24
500
There are 60480 numbers.
840
There are 3024 of them.
180 of them.
1 set
It is 120 if the digits cannot be repeated.
There are 5! = 120 such numbers.