As I've been learning more about A$/$B testing, I've come across something called A$/$B$/$N testing. What is that?

A$/$B$/$N testing is just another name for A$/$B testing. I really don't know why some people add the N at the end.

A$/$B$/$N testing indicates that you are going to conduct a standard A$/$B test, but only for a certain number $($N$)$ times. For example, you only want $500$ people to see the A input and $500$ people to see the B input. This helps to keep results manageable and easier to interpret.

A$/$B$/$N testing indicates that you can test more than two inputs at the same time $($N is used to signify any number$).$ For example say you want to test the color of a Buy Now button to see which one customers respond to best. A$/$B$/$N testing allows you to test red, blue, black, green, yellow, and orange all at the same time.

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