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There are several classical books on mathematics which are a pleasure to study from. However, after reading its materials and working through the theorems and solved problems, I feel very uncomfortable while solving questions given at the back of the chapter. This happens when they don't have any answers (especially for numerical problems ). How do you handle this problem?

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You either:

  1. Get the teacher's guide
  2. Get someone to check your work
  3. Find similar problems that you do have the answers for and use the same technique
  4. You check your work, then check it again, and possibly again

I find teacher's guides are often quite useful for reasons beyond just the answers, though.

In addition, some textbooks have just the answers available under separate cover.

Lastly, try contacting the publisher to see what other classroom resources are available.

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If they are truly classical books I think you may be able to find many answers on the internet. That can be as simple as googling book title + question number, or answers + book title or searching for the essential parts of the question text.

Since you do not give actual examples I cannot back this up with facts.

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This can indeed be frustrating. The instructor's guide suggestions are unlikely to help a great deal with classic texts or texts aimed at the graduate student level or higher. The best solution that I have found is to read such texts with 1-3 other people. The discussions that result are most helpful, and not merely for sanity checks of exercise solutions.

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