WEBVTT
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If 𝐴 is equal to six, five, nine, one and 𝐵 is equal to seven, five, nine, eight, what is the intersection of 𝐴 and 𝐵?
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This upside-down U is a symbol for intersection.
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And an intersection of two sets is the set of all common elements between those sets.
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So what elements do 𝐴 and 𝐵 have in common?
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They both have five.
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They both have nine.
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Only 𝐴 has six and one.
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And only 𝐵 has seven and eight.
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Therefore the intersection of 𝐴 and 𝐵 will be the elements five and nine.