2. (20 points) Prove that 7' + 72 + ... +7" 7 - (7 (7" - 1) for all n 21.
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2. (20 points) Prove that 7' + 72 + ... +7" 7 - (7 (7" - 1) for all n 21.
2. (20 points) Prove that 7' + 72 + ... +7" 7 - (7 (7" - 1) for all n 21.
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