Prove the formula for the sum of the n first positive integers: M 3 i
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Prove the formula for the sum of the n first positive integers:
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M Σ 3 Σ i = 1 + 2 + 3 + ... + n + - i=1 = n(n + 1) 2
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This formula can be proved by mathematical induction or by the following method used b...View the full answer
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