Read the text carefully and answer the questions :
Three persons A, B and C were given a task, whose probabilities of completion their task on time are $\frac{1}{3}, \frac{1}{4}$ and $\frac{1}{5}$ respectively. They were asked to complete the task on time independently.
The probability that B alone complete the task on time is:
Answer & explanation
Correct answer: option 4
P(B completes alone) = $P(B) P(\bar{A}) P(\bar{C})$
= $\frac{1}{4} × \frac{2}{3} × \frac{4}{5} = \frac{2}{15}$
Option: 2