A student has to opt for 2 subjects out of 5 subjects for a course. Namely commerce, economics, statistics, mathematics 1 and Mathematics 2, Mathematics 2 can be offered only if mathematics 1 has also opted. The number of different combinations of two
Q1. A student has to opt for 2 subjects out of 5 subjects for a course. Namely commerce, economics, statistics, mathematics 1 and Mathematics 2, Mathematics 2 can be offered only if mathematics 1 has also opted. The number of different combinations of two
Answer: 7
Explanation: Without restriction: C(5,2) = 10; subtract invalid pairs where Math 2 is chosen without Math 1 (3 such pairs); valid combinations = 10 − 3 = 7.