There are 25 men on the roster of the baseball team. 3 are catchers, 8 are infielders, 6 are outfielders, and the remainder are pitchers. What is the probability that out of two players chosen at random, they would be a pitcher and an infielder?

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.  

any of them that add up to 180 degrees.