SOLUTION: computer with an old processor locks up if more than 4 application are running. 20 applications stored in program file. how many different sets of 4 can run

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Question 255633: computer with an old processor locks up if more than 4 application are running. 20 applications stored in program file. how many different sets of 4 can run
Found 2 solutions by drk, edjones:
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
This is a combination problem:
20c4 = 4845

Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
nCr=n!/((n-r)!r!) Combination of n things taken r at a time.
20C4=20!/((20-4)!4!
=4845 different sets
.
Ed