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starting at 1111 and going to 9999,

there are 9*9*9*9 combinations (1...9 for each digit) = 6561

Q: How many 4 digit number combinaton between 1to9?

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1to9 are counting numbers Counting numbers are positive whole numbers and not zero. They can also be called 'natural numbers'. They are so called because when you count, you start at +1, then +2, +3 and continue on in this... That would be zero, and negative integers. "Counting numbers" refers to integers (whole numbers) that are positive (larger than zero).