SOLUTION: A pollster randomly selected 4 of 10 available people. How many different groups of four are possible?

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Question 907871: A pollster randomly selected 4 of 10 available people.
How many different groups of four are possible?
Answer by Fombitz(32388) About Me  (Show Source):
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First choice : 10 choices available
Second pick : 9 choices available
Third pick : 8 choices available
Fourth pick : 7 choices available
N=10%2A9%2A8%2A7
N=5040