SOLUTION: Suppose that a composing has 6 digit ID numbers consisting of numbers from 0-9. How many such ID numbers contain no 7s and have no repeated digits?
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Question 1042143: Suppose that a composing has 6 digit ID numbers consisting of numbers from 0-9. How many such ID numbers contain no 7s and have no repeated digits? Found 2 solutions by jorel555, MathTherapy:Answer by jorel555(1290) (Show Source):
You can put this solution on YOUR website! 0-9 equals 10 digits.
Removing "7" leaves 9 possible digits.
9 non-repeating digits chosen 6 at a time equals:
9!/6!3!=84 possible combinations of non-repeating numbers.
You can put this solution on YOUR website!
Suppose that a composing has 6 digit ID numbers consisting of numbers from 0-9. How many such ID numbers contain no 7s and have no repeated digits?
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