Description for Correct answer:
Given expression can be written as

\( \Large \frac{1}{3}\left[ \left(1-\frac{1}{4}\right) + \left(\frac{1}{4}-\frac{1}{7}\right) + \left(\frac{1}{7} - \frac{1}{10}\right) + \left(\frac{1}{10}-\frac{1}{13}\right) + \left(\frac{1}{13}-\frac{1}{16}\right) \right] \)

= \( \Large \frac{1}{3}\left[ 1 - \frac{1}{16} \right] = \frac{1}{3} \left(\frac{16-1}{16}\right) \)

= \( \Large \frac{1}{3} \times \frac{15}{16} = \frac{5}{16} \)