Consider a 10-question test in which each question can be answered either correctly or incorrectly. (a) How

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Consider a 10-question test in which each question can be answered either correctly or incorrectly.

(a) How many different ways are there to answer the questions so that eight are correct and two are incorrect? 

(b) How many different ways are there to answer the questions so that at least eight are correct?

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A Survey of Mathematics with Applications

ISBN: 978-0134112107

10th edition

Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde

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