As henry has mentioned this is a problem that is similar to the one discussed in class.
1= 1 coupon
2 = number of extra bars for a different coupon
2 is a geometric Random variable
3= # of extra bars after 2nd coupon to get 3rd coupon
3 is geometric Random Variable
4 is geometric Random variable
n is geometric Random Variable
Average number of coupons E[# needed]=
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