the probability that the person chooses the $1 suitcase is .2, .2 for the $10 one, .2 for the $100 and so on. Then if you add up .2*1 + .2*10 + .2*100 + .2*1000 + .2 10000 that will give you the average value that you can go home with. Subtracting 30% from that should give you the amount that the person takes home.

Alumni Liaison

Abstract algebra continues the conceptual developments of linear algebra, on an even grander scale.

Dr. Paul Garrett