Answer:
The choice A .
[tex]n = 2 \frac{1}{21} [/tex]
Step-by-step explanation:
[tex]n - 1 \frac{1}{3} = \frac{5}{7} \\ \\ n - \frac{4}{3} = \frac{5}{7} \\ \\ n = \frac{5}{7} + \frac{4}{3} \\ \\ n = \frac{15}{21} + \frac{28}{21} \\ \\ n = \frac{43}{21} = 2 \frac{1}{21} [/tex]
