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

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Question 658947: A pollster selected 4 of 10 available people. How many different groups of 4 are possible?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: Compute 10 C 4 using the formula

n C r = (n!)/(r!(n-r)!)

In this case, n = 10 and r = 4, so

n C r = (n!)/(r!(n-r)!)

10 C 4 = (10!)/(4!(10-4)!)