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• 2009, Blair Madore, GRE Math Workbook (in English), Barron's Educational Series, →ISBN, page 25:

  What values you should try? This can depend on the question, but here are some good suggestions.

  • Try a positive and a negative number.

  • Try zero.

  • Try a number between 0 and 1 and a number greater than one.

  • Try a very small number (like 0.001) and a very large number like 1,000.

  • Try a prime number and a composite number.