1/4
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There are a few different ways of writing a ratio, which are shown here:As a fraction- like 3/4, or like this 3:4 or 3 to 4
1/4 .25 25%
How many different ways can we arrange 9 objects taken 3 at a time?
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}
9×8×7×6×5=15,120