The conversation between human and AI assistant.
How many 4 digit numbers can be formed using 1, 2, 3 and 4 without repeating a digit?
How did you arrive at that answer?
There are 4 choices for the first digit, 3 choices for the second digit, 2 choices for the third digit, and 1 choice for the fourth digit. Multiplying these choices together gives us 4*3*2*1=24 different possible 4-digit numbers.