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Every even number is followed by an odd number and every odd number is followed by an even number. What is the meaning ?
Solution:
As known, Even numbers are those numbers which are divisible by $2$, even number ends with $2,\ 4,\ 6,\ 8, 0...$.
Odd numbers are those numbers which are not divisible by $2$. Odd number ends with the digit $1,\ 3, 5,\ 7,\ 9...$
e.g. $1,\ 2,\ 3,\ 4,\ 5,\ 6,\ 7,\ 8,\ 9,\ 10,\ .......$
Here $2,\ 4,\ 6,\ 8,\ 10....$ are even numbers and followed by by $1,\ 3,\ 4,\ 5,\ 7,\ 9...$ which are odd numbers.
Similarly, odd numbers $1,\ 3,\ 5,\ 7,\ 9,\ .....$ are followed by even numbers $2,\ 4,\ 6,\ 8,\ 10...$ respectively.
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