Among Any Three Consecutive Integers, One Must Be Divisible by 2

When examining any sequence of three consecutive integers, a simple yet powerful pattern emerges in number theory: among any three consecutive integers, exactly one must be divisible by 2, meaning it is even. This insight reveals a fundamental property of integers and helps reinforce foundational concepts in divisibility.

Understanding Consecutive Integers

Understanding the Context

Three consecutive integers can be expressed algebraically as:
n, n+1, n+2, where n is any integer. These numbers follow each other in sequence with no gaps. For example, if n = 5, the integers are 5, 6, and 7.

The Key Property: Parity

One of the core features of integers is parity — whether a number is even or odd.

Even numbers are divisible by 2 (e.g., ..., -4, -2, 0, 2, 4, ...).
Odd numbers are not divisible by 2 (e.g., ..., -3, -1, 1, 3, 5, ...).

In any two consecutive integers, one is even, and one is odd. This alternation continues in sequences of three.

Among any three consecutive integers, one must be divisible by 2 (since every second integer is even).

Key Insights

Why One Must Be Even

Consider the three consecutive integers:

n (could be odd or even)
n+1 (the number immediately after n; opposite parity)
n+2 (again distinguishing parity from the previous)

By definition, among any two consecutive integers, exactly one is even. Since n and n+1 are consecutive:

If n is even (divisible by 2), then n+1 is odd and n+2 is even (since adding 2 preserves parity).
If n is odd, then n+1 is even, and n+2 is odd.

In both cases, n+1 is always even — making it divisible by 2. This means among any three consecutive integers, the middle one (n+1) is always even, thus divisible by 2.

Broader Implications and Examples

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Final Thoughts

This property is more than a curiosity — it’s a building block in modular arithmetic and divisibility rules. For instance:

It helps explain why every third number in a sequence is divisible by 3.
It supports reasoning behind divisibility by 2 in algorithms and number theory proofs.
It’s useful in real-world scenarios, such as checking transaction counts, scheduling, or analyzing patterns in discrete data.

Example:

Take 14, 15, 16:

14 is even (divisible by 2)
15 is odd
16 is even (but the middle number, 15, fulfills the divisibility requirement)

Conclusion

Every set of three consecutive integers contains exactly one even number — a guaranteed consequence of how parity alternates between even and odd. This simple principle is a window into deeper number patterns and proves why, among any three consecutive integers, one is always divisible by 2.

Understanding and applying this fact strengthens your number sense and supports logical reasoning in mathematics and computer science.

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Discover why among any three consecutive integers, one must be even — the guaranteed divisibility by 2. Learn the logic behind this fundamental number property and its implications in mathematics.