50. After polling a class of 20 music students by a show of hands, you find that 8 students play the guitar and 9 students play the piano. Given that information, what is the minimum number of students in this music class who play both the guitar and the piano?

Answer and Explanation

Your Answer is

Correct Answer is F

Explanation

For this kind of problem, first check whether the sum of the two is greater than the total value, 8 + 9 = 17 < 20, it is entirely possible that 8 of the 17 students can play guitar and piano respectively, and the minimum is 0.