There is a bag containing 16 green marbles, 14 blue marbles and 13 red marbles. what is the least amount of marbles that i must pick out to be sure that i got 3 different colours?

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 ̊ and to the other is 52 ̊. how far apart are the cars?