According to Descartes' rule of signs, how many possible i* values are there for net cash flows

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According to Descartes' rule of signs, how many possible i* values are there for net cash flows that have the following signs?
(a) + – + + + – +
(b) – – – + + + + +
(c) + + + + – – – + – – – + – + – – –

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Engineering economy

ISBN: 978-0073376301

7th Edition

Authors: Leland Blank, Anthony Tarquin

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