What is the probability that a number selected from the numbers 1, 2, 3, …., 15 is a multiple of 4?

An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.

A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is :

(i) White?

(ii) red?

(iii) black?

(iv) not red?

A bag contains 6 red, 8 black and 4 white balls. A ball is drawn at random. What is the probability that ball drawn is not black?

A bag contains 5 white and 7 red balls. One ball is drawn at random. What is the probability that ball drawn is white?