In Section 5.2 we prove by induction that the number of lines printed by a call to drawInterval(c) is 2c − 1. Another interesting question is how many dashes are printed during that process. Prove by induction that the number of dashes printed by drawInterval(c) is 2c+1 −c−2.
2. Write a recursive method that will output all the subsets of a set of n elements (without repeating any subsets).
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