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Probability
CBSE 2026 Board Exam Set 1 (Code 30/7/1)
CBSE_BOARD_PYQ_2026_30_7_1
Grade 10

Question:

[Section A]

If the probability of an event happening is $0.21$, then the probability of it not happening is:

(A) $0.21$
(B) $0.79$
(C) $1.21$
(D) $0.00$

Step-by-Step Solution

Key Concept: $P(\bar{E}) = 1 - P(E) = 1 - 0.21 = 0.79$.
Sol. (B) $0.79$. [1.0 Mark]

Correct Answer: (B) $0.79$
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