There are 8 different beers, they offer a discount price on 4 different days,
(a). If they want to select 4 different beers the different choices are:
(b). If the repetitions are allowed the number of different combinations are:
(c). Premium beers
Non premium beers
Number of choices if the premium beers are fixed on the 1st day
Number of choices if the premium beers are fixed on the 2 nd day
Therefore, the total number of choices if the premium beers are used on either 1 or 2 of the 4 days
.
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