Question

Each candy bar has a coupon

2 different coupons

Any candy bar can have a random coupon

Q: How many bars do you need to buy on average to get both coupons?

Answer

1 bar = 1 coupon

X = # bars for second coupon

~Geom(1/2)

Avg. # of bars = 1 + 2 = 3


Back to ECE302 Fall 2008 Prof. Sanghavi

Alumni Liaison

Prof. Math. Ohio State and Associate Dean
Outstanding Alumnus Purdue Math 2008

Jeff McNeal