Question

A box contains 3 blue, 2 white and 4 red marbles. If a marble is drawn at random from the box, what is the probability that it will not be a white marble?

Options

• `1/3`

• `4/9`

• `7/9`

• `2/9`

Answer 1

`bb(7/9)`

Explanation:

Total possible outcomes = Total number of marbles

= (3 + 2 + 4) 

= 9 

Let E be the event of not getting a white marble.

It means the marble can be either blue or red but not white.

Number of favourable outcomes =  (3 + 4) = 7 marbles.

∴ P(not getting a white marble) = `7/9`.