Derive the formula 1 + 2 + 3 + ... + n = n(n + 1)/2 Let
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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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Related Book For
Elementary Linear Algebra with Applications
ISBN: 978-0471669593
9th edition
Authors: Howard Anton, Chris Rorres
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