Answer:
Without repetition: 6 numbers
With repetition: 27 numbers
Explanation:
Given:
Numbers: 2;3;4 (3 numbers in total)
Without repetition (in the first place you can write all 3 out of 3 numbers, in the 2nd place two, since you cannot repeat the 1st number and so on)
Multiply the choice options:
3 × 2 × 1 = 6 (we don't divide it by the factorial of 3, because the order of forming numbers is important)
.
With repetition (in all three places you can write all 3 given numbers, since you can repeat them)
Multiply the choice options:
3 × 3 × 3 = 27 (the order is important)