The girl's choir can choose a uniform from 70 uniforms.
What are permutations and combinations?
The different ways in which objects from a set can be picked, often without replacement, to produce subsets are known as permutations and combinations. When the order of selection is a factor, this selection of subsets is termed a permutation; when order is not a factor, it is called a combination.
How do we solve the given question?
We are given that a girls' choir is choosing a uniform for their concert. There are 7 options for the uniform blouse and 10 skirt options.
We use permutations and combinations to find the number of uniforms the girl's choir can choose from.
We can say that for every blouse among the 7 options available, the girl's choir can choose any of the 10 skirts, that is, there will be 10 skirt options for each blouse.
∴ The girl's choir can choose a uniform from 7*10 = 70 uniforms.
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