
In Exercises 59 -62, recall that in Section 1.1 we introduced the following arrangement of numbers, which is called Pascal’s triangle.
Notice that the fourth line* of this triangle contains the numbers 1, 4, 6, 4, 1, which, as we saw in Example 5 are precisely the counts of the number of the subsets of a four-element set with 0, 1, 2, 3, and 4 elements respectively.
*We start counting these lines with 0, not 1.
With this observation in mind, how do you interpret the fifth line of Pascal’s triangle?

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