Q2 of 54 Page 320

A box contains 5 red marbles. 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be

not green?

Total number of marbles = 5 + 8 + 4 = 17

⇒ Number of green marbles = 4


⇒ P(Marbles taken out is green) =


⇒ P(Marbles taken out is green) =


⇒ P(Marbles taken out is not green) = 1 – P(marbles taken out is green)


⇒ P(Marbles taken out is not green) =


⇒ P(Marbles taken out is not green) =


⇒ P(Marbles taken out is not green) =


∴ Probability that marble taken out is not green is


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