The conversation between human and AI assistant.
Given 9 digits to work with, how many possible combinations of 3 digits are there?
Can you tell me how many possible combinations of 3 digits you can make from 9 digits?
Of course! The formula for calculating the number of possible combinations is nCr = n!/r!(n-r)!, where n is the total number of items, and r is the number of items being chosen at a time. In this case, we have 9 digits to work with, and we're choosing 3 digits, so the formula would be 9C3 = 9!/3!(9-3)! = 84. So there are 84 possible combinations of 3 digits from 9 digits.