Express the following in the X notation: a. x1 + x2 + x3 + x4 + x5

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Express the following in the X notation:
a. x1 + x2 + x3 + x4 + x5
b. x1 + 2x2 + 3x3 + 4x4 + 5x5
c. (x21 + y21) + (x22 + y22) + ... + (x2k + y2k)
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Essentials of Econometrics

ISBN: 978-0073375847

4th edition

Authors: Damodar Gujarati, Dawn Porter

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