The positive integer one or 1 is smallest positive integer that is greater than zero.
When a number is added by one, the number is increased by one.
For example, 3+1=4.
When a number is subtracted by one, the number is decreased by one. Examples: 2-1=1, 4-1=3
When one is subtracted by a number, it depends on what the number is.
For example: 1-2=-1, 1-(-2)=3
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