Derive the formula 1 + 2 + 3 + ... + n = n(n + 1)/2 Let

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Derive the formula
1 + 2 + 3 + ... + n = n(n + 1)/2
Let Sn = 1 + 2 + 3 + ... + n. Write the terms of Sn in reverse order and add the two expressions for Sn.

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Elementary Linear Algebra with Applications

ISBN: 978-0471669593

9th edition

Authors: Howard Anton, Chris Rorres

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Question Posted: Jun 17, 2016 08:14 AM

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Derive the formula 1 + 2 + 3 + ... + n = n(n + 1)/2 Let

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Elementary Linear Algebra with Applications

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