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{\bf Math 113 Homework 7, due 3/12/2019}
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{\bf 1.} 9.1-9.2

{\bf 2.} 9.13, (a, c): do the calculation by using permutation notation.

{\bf 3.} 9.34

{\bf 4.} 10.28-29

{\bf 5.} 11.1, 11.3, 11.6

{\bf 6.} 11.15

{\bf 7. extra credit:} 10.38
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