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Real Numbers

Question
CBSEENMA10009490
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A bag contains 7 red, 5 white and 3 black balls. A ball is drawn at random from the bag, find the probability that the drawn ball is :

(i)    red or white, -
(ii)    not black
(iii)    neither white nor black.

Solution

Solution not provided.
Ans.  left parenthesis straight i right parenthesis space 4 over 5 space left parenthesis ii right parenthesis space 4 over 5 space left parenthesis iii right parenthesis 7 over 15

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