JEE Main Mathematics question
If , then how many subsets of contain the elements 2, 3 and 5?
Answer: (B)
Solution
2, 3, 5 are fixed; each of 1, 4, 6 is free: .
If , then how many subsets of contain the elements 2, 3 and 5?
2, 3, 5 are fixed; each of 1, 4, 6 is free: .