Video: The Properties of the Null Set

Is the following set null or not? The set of triangles with 4 sides.

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Video Transcript

Is the following set null or not? The set of triangles with four sides.

For a set to be null, the set must be empty, meaning there are no elements in it. So how many triangles are there with four sides?

That would be empty because triangles are only made up of three-sided shapes.

Therefore, the set is null.

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