The box contains 20 balls of the same shape, among which there are 2 blue, 5 white, 9 red and 4 green.

The box contains 20 balls of the same shape, among which there are 2 blue, 5 white, 9 red and 4 green. Find the probability that a ball drawn at random turns out to be white or red

decision
5 + 9 = 14
14/20 = 0.7

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.