Probability — Formula Sheet
CBSE · Class 11 · Mathematics
12 formulas from Probability (CBSE Class 11 Mathematics) on one page, grouped by topic. Part of the CBSE Class 11 Mathematics syllabus.
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Formulas and Key Relations
2. Algebra of Events
A' = S - A
A ∪ B
A ∩ B
A - B = A ∩ B'
4. Axiomatic Approach to Probability
P(E) ≥ 0
P(S) = 1
P(A ∪ B) = P(A) + P(B)
P(φ) = 0
Axiomatic Approach to Probability
For any event E, P(E) ≥ 0.
P(S) = 1.
Probability of Equally Likely Outcomes
For equally likely outcomes, P(ωi) = 1/n where n is the number of sample points.
If n(S) = n and n(E) = m, then P(E) = m/n.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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