A student has 5 courses to take from Mathematics and physics. There are 4 courses in Mathematics and 3 in Physics which he can choose his courses so that he takes exactly two courses in Physics?
48
12
10
7
Correct answer is B
Mathematics = \(^{4} C_{3} = 4\)
Physics = \(^{3} C_{2} = 3\)
\(\therefore\) He can choose in 4 x 3 = 12 ways.