Why Do Textbook Authors Only Provide Answers for Odd Numbered Questions?

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Textbook authors often provide answers only for odd-numbered questions to encourage independent problem-solving and critical thinking among students. This approach prevents students from simply checking their answers and promotes deeper understanding of the material. Professors frequently assign even-numbered questions to challenge students to apply concepts without immediate feedback. This method aims to enhance learning by requiring students to work through problems on their own. Ultimately, the strategy fosters a more engaging and educational experience in mathematics and science subjects.
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Why do several authors of standard text-books provide answers only for odd numbered questions? Any particular reason for this?
 
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And why does the professor always assign the even numbered ones?
 
To see if one can distinguish between the two.
 

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