JEE Main Mathematics question
If , then the number of subsets of set containing the element 3 is
Answer: (C)
Solution
3 is fixed in the subset; each of the other 3 elements may or may not be included: .
If , then the number of subsets of set containing the element 3 is
3 is fixed in the subset; each of the other 3 elements may or may not be included: .