How would i do this math?

Posted on 2015-12-08 07:28:00 in Math by DIEUGUO

From a group of 10 people, 2 will be selected for a committee. How many different combinations of 2 people could be selected from the 10 people (for example, Bill and Jack, or Bill and Marla, or Jack and Marla, etc.)? _90_____

b. From a group of 10 people, 3 will be selected for a committee. How many different combinations of 3 people could be selected from the 10 people? ______

c. From a group of 10 people, 5 will be selected for a committee. How many different combinations of 5 people could be selected from the 10 people? ______

d. From a group of 10 people, 8 will be selected for a committee. How many different combinations of 8 people could be selected from the 10 people? ______

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