A Mean Above the Middle
Difficulty: Medium · Topics: Discrete Mathematics, Sets, Subsets
A=\1,2,3,4,5,6\
In how many of the three-element subsets of A is the arithmetic mean of the numbers greater than 3.5?
Difficulty: Medium · Topics: Discrete Mathematics, Sets, Subsets
A=\1,2,3,4,5,6\
In how many of the three-element subsets of A is the arithmetic mean of the numbers greater than 3.5?