Question 87538
A computer locks up if more than 4 applications are running simultaneously.  If the owner has 20 applications stored in his program file, how many different sets of 4 can he run, so that his cmpuer does not lock up?
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20C4 = [20*19*18*17]/[1*2*3*4] = 4845 sets of 4 programs
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Cheers,
Stan H.