Description for Correct answer:
The number of pieces of chocolate with Maniu

= \( \Large 1 - \left(\frac{1}{4}+\frac{1}{3}+\frac{1}{6}\right) \)

= \( \Large 1 - \left(\frac{3 + 4 + 2}{12}\right) \)

= \( \Large 1 - \frac{9}{12} = \frac{12 - 9}{12} = \frac{3}{12} \)

Hence, number of pieces of chocolate left with Manju is 3.