A number not divisible by 2 is called an odd number. Any number whose unit digit(last digit) is either 1,3,5,7 or 9 is an odd number.
The set of all odd numbers is represented as
Odd numbers = { 2n+1: n ∈ Z } where Z is the set of all integers.
- When an even number is subtracted from an odd number, it results in an odd number.
- When two odd numbers are subtracted, it results in an even number.
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