interval in math

what is the interval for the following set of numbers 3,4,6,7,8,3,2,1

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1. [1..4]∪[6,8]
or
[1..8]-{5}

equivalent to:
{x∈ℤ | 1≤x≤4 ∪ 6≤x≤8}

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posted by MathMate

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