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Let n represent the first number in a sequence of four consecutive numbers. Then the second number in the sequence will then be represented as n + 1. If we continue this for the other two numbers, you will get this equation:

n + (n + 1) + (n + 2) + (n +3)

If we add the first and the last values in the equation, we get n + n + 3. This simplifies to 2n + 3. If we now add the second and third values in the equation, we get n + n + 1 + 2. This simplifies to 2n + 3 as well. Since 2n + 3 = 2n + 3 no matter what n is, this means that whatever number you pick as your first number, the statement will always be true.