1. Ten trees - four pines, four cedars, and two spruce- are planted in two parallel rows of five trees. How many arrangements are possible if each row must have the same composition of trees, not necessarily in the same order.(adsbygoogle = window.adsbygoogle || []).push({});

2. Suppose we want to creat subsets of the ten digits {0, 1, 2, ...., 9}

a) How many subsets can be created, including the empty set?

b) How many of the subsets contain only digits less than 7?

c) How many of the subsets contain 0 or 9?

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# Arrangement problem

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