Five From Seven
Difficulty: Medium · Topics: Discrete Mathematics, Sets, Subsets
A=\1,2,3,4\, B=\1,2,3,4,5,6,7\
In how many of the five-element subsets of B are there at least two elements of A?
Difficulty: Medium · Topics: Discrete Mathematics, Sets, Subsets
A=\1,2,3,4\, B=\1,2,3,4,5,6,7\
In how many of the five-element subsets of B are there at least two elements of A?