rosting method
rule method
set-builder rotation
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It is called creating or naming a set!
First of all, there are many different ways to express 3 in set builder notation, to be more precise, there are many different ways to express the set containing 3 as its only element. Here are a few ways {x∈R | x=3} or {x∈N | 2<x<4} or even just {3}
How many different ways can we arrange 9 objects taken 3 at a time?
1/4
12 There are 4 ways of choosing the first coin, leaving 3 coins from which to make the second choice. The number of combinations is therefore 4 x 3 = 12.