Ajar contains 20 green, 23 orange, 20 red, and 15 brown marbles. a marble is drawn at random. what is the probability that the marble is orange, green, or red?

total marbles: 20 + 23 + 20 + 15 = 78 marbles

probability of orange: 23/78

probability of green: 20/78

probability of red: 20/78

add up fractions

probability of orange, green or red:

63/78

can also simplify to

21/26

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .