SOLUTION: Of a classroom filled with 20 students, 2 will be selected to stay after school and correct homework for extra credit. How many combinations are possible?

Question 347745: Of a classroom filled with 20 students, 2 will be selected to stay after school and correct homework for extra credit. How many combinations are possible?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Of a classroom filled with 20 students, 2 will be selected to stay after school and correct homework for extra credit. How many combinations are possible?
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20C2 = (20*19)/(1*2) = 190
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Cheers,
Stan H.
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