Question
A box contains 4 red balls , 5 green balls and 6 white balls. A ball is drawn at random from the box . What is the probability that the ball drawn is either red or green ?
Answer: Option B
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Total number of balls = ( 4 + 5 + 6) = 15.
`:,` n(S) = 15.
Let `E_1` = event of drawing a red ball
and `E_2` = event of drawing a green ball
Then , `E_1 nn E_2 = phi`
` P (E_1 or E_2) = P(E_1) + P(E_2)`
= `(4/15 + 5/15) = 9/15 = 3/5`
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