The conversation between human and AI assistant.
How many two-digit numbers can you form using the digits 1,2,3,4,5,6,7,8 and 9 without repetition?
Can you tell me how many two-digit numbers can you form using the digits 1,2,3,4,5,6,7,8 and 9 without repetition?
Sure! You can form 72 two-digit numbers without repetition using these digits.