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What is the simplest form of the fraction 3/7?

  1. 21/7

  2. 4/7

  3. 3/7

  4. 9/7

The correct answer is: 3/7

The correct answer is 3/7. This is because in its simplest form, a fraction has no common factors that can divide both the numerator and denominator. Option A has a common factor of 7, option B has a common factor of 2, and option D has a common factor of 3, making 3/7 the only possible simplest form for this fraction.