Task: Question Answering
Input (English): Problem: a class consists of 15 biology students and 10 chemistry students. if you pick two students at the same time, what ' s the probability that one is maths and one is chemistry ?
Options: a. 2 / 7, b. 5 / 7, c. 1 / 2, d. 3 / 7, e. 1 / 2
Output (English): c