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Use the Principle of Mathematical Induction to Show That the Statement

Question 67

Essay

Use the Principle of Mathematical Induction to show that the statement is true for all natural numbers n.
- 7+14+21+…+7n=7n(n+1)27 + 14 + 21 + \ldots + 7 n = \frac { 7 n ( n + 1 ) } { 2 }

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First, we show the statement is true whe...

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