Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 1 - Problem Solving and Critical Thinking - 1.3 Problem Solving - Exercise Set 1.3: 63

Answer

Friday

Work Step by Step

Days on which first person lies = Friday, Saturday, Sunday Days on which second person lies = Tuesday, Wednesday, Thursday So, today is Friday, because if first person says that I lied yesterday which means Thursday, the day on which he doesn't lie, but its Friday so he can lie about yesterday which is correct. Similarly, second person says truth on Friday, so if he says that I lied yesterday, means he is saying the truth today and lied yesterday which is Thursday, which is correct. So, today is Friday.
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