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In the group \(S_{3}\), there are exactly :

  • A.2 elements satisfying \(x^{3} = e\) and 3 elements satisfying \(x^{2} = e\)
  • B.3 elements satisfying \(x^{3} = e\) and 4 elements satisfying \(x^{2} = e\)
  • C.2 elements satisfying \(x^{3} = e\) and 4 elements satisfying \(x^{2} = e\)
  • D.3 elements satisfying \(x^{3} = e\) and 3 elements satisfying \(x^{2} = e\)

Answer: B

\(S_{3}\) has 3 elements with \(x^{3} = e\) and 4 elements with \(x^{2} = e\).

\(S_{3}\) has six elements: the identity, three transpositions (order 2) and two 3-cycles (order 3).

  • \(x^{3} = e\): the identity and the two 3-cycles, 3 elements.
  • \(x^{2} = e\): the identity and the three transpositions, 4 elements.

Options with 2 elements for \(x^{3} = e\), or 3 for \(x^{2} = e\), forget to count the identity, which satisfies every equation \(x^{k} = e\).

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