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A city council is composed of 11 total people. There are 7 liberals and 4 conservatives. A committee (group) of 3 is to be chosen

A city council is composed of 11 total people. There are 7 liberals and 4 conservatives. A committee (group) of 3 is to be chosen to attend a convention. How many ways can a 3-person committee of all liberals be chosen from the council

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