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2. (5 pts) Prove by induction that 2Vn +1-1) for all n eZ. j-1 3. (5 pts) Prove by induction that 4n+1 + 52n-1 is

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2. (5 pts) Prove by induction that 2Vn +1-1) for all n eZ. j-1 3. (5 pts) Prove by induction that 4n+1 + 52n-1 is divisible by 21 for all n E Z+

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