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Probability

NCERT Exemplar

CBSE

Grade 10

Question:

If the probability of an event is $p$, then the probability of its complementary event is:
(a) $p - 1$
(b) $1 - p$
(c) $1 - \dfrac{1}{p}$
(d) $\dfrac{1}{p}$

Step-by-Step Solution

Key Concept: $P(E) + P(\bar{E}) = 1 \Rightarrow P(\bar{E}) = 1 - P(E)$.

$P(\text{not } E) = 1 - p$. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Applying $1 - p$: 1.0 Mark

Correct Answer: $1 - p$

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