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C3 Functions question

What does the x E 3 mean in this case? screenshot.png
Original post by TSR561
What does the x E 3 mean in this case? screenshot.png

X is an element of a set with 3 members.
Reply 2
Original post by uberteknik
X is an element of a set with 3 members.


Sorry, I don't know exactly what that means. Are there only 3 numbers that can be used in the formula?
Original post by TSR561
What does the x E 3 mean in this case? screenshot.png

As it stands, it doesn't make sense because "3" is not a set whilst "\in" generally refers exclusively to set membership. I presume it's a typo of some sort.

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