Приведите к общему знаменателю дроби \(\frac{1}{3}\) и \(\frac{2}{7}\)

• \(\frac{7}{21}\) и \(\frac{6}{21}\)
• \(\frac{1}{21}\) и \(\frac{2}{21}\)
• \(\frac{7}{14}\) и \(\frac{6}{14}\)