Answer:
Step-by-step explanation:
The number of ways of choosing objects from is . Specifically, .
Since there are sophomores, there are ways of picking 1 sophomore from .
By the same reasoning, there are ways of picking 1 junior and ways of picking 1 senior.
The total number of ways of picking 1 sophomore, 1 junior and 1 senior =
f^-1(x)=1/x+4
x>2
x+1>3.
Subtract 1 from each side
x+1-1 > 3-1
There is an open circle at 2 and the lines goes to the right