Concept explainers
Undercover friend (ExH). Your friend gives you a list of three five-digit numbers, but she only reveals one digit in each:
3????
?8???
??2??
Can you describe a five-digit number you know for certain will not be on her list? If so, give one; if not, explain why not.
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Chapter 3 Solutions
The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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