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Probability
RD Sharma
CBSE
Grade 10
Question:
A bag contains $5$ white, $7$ red, $4$ black and $2$ blue balls. A ball is drawn at random. Find the probability that the ball drawn is: (i) White or blue (ii) Neither red nor black
Step-by-Step Solution
Key Concept: Total balls $= 5 + 7 + 4 + 2 = 18$.<br>(i) White or blue $= 5 + 2 = 7 \Rightarrow P = 7/18$.<br>(ii) Neither red nor black $=$ White or blue $= 7 \Rightarrow P = 7/18$.
(i) $P(\text{White or Blue}) = 7/18$. [1.5 Marks] (ii) $P(\text{Neither Red nor Black}) = 7/18$. [1.5 Marks]
--- 🎯 Official CBSE Marking Scheme: Part (i) $P = 7/18$: 1.5 Marks Part (ii) $P = 7/18$: 1.5 Marks
Correct Answer:
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