A jar contains 4 red marbles numbered 1 to 4 and 10 blue marbles numbered 1 to 10. A marble is drawn at random from the jar.

Question

A jar contains 4 red marbles numbered 1 to 4 and 10 blue marbles numbered 1 to 10. A
marble is drawn at random from the jar. Find the probability the marble is blue or even
-
numbered.

Answer 1

What is the probability that the marble is red AND odd-numbered?

The probability that the marble is red is 4/14 or 2/7.

The probability that it is odd is 7/14 or 1/2.

The probability it is both is the two probabilities multiplied together.

The probability it isn't red AND odd is 1 - that probability. That is also the probability that it is either blue OR even.