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Twice a number increased by 28=48 plus the number
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Since the order of the books chosen doesn't matter, we use the combination formula to find the number of possible selections. Recall that a combination of k items from a set of n items is given by 
.
In this problem, n = 8 and k = 3. So the number of possible selections is
. Thus the answer is 56.
In this problem, n = 8 and k = 3. So the number of possible selections is