Task: Question Answering
Input (English): Problem: two brother x and y appeared for an exam. the probability of selection of x is 1 / 3 and that of b is 2 / 7. find the probability that both of them are selected.
Options: a. 2 / 69, b. 2 / 21, c. 2 / 23, d. 2 / 29, e. 2 / 10
Output (English): b