Permutations and Combinations — Important Questions
CBSE · Class 11 · Mathematics
127 important questions from Permutations and Combinations for CBSE Class 11 Mathematics, with answers. Part of the CBSE Class 11 Mathematics syllabus.
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Important Questions from Permutations and Combinations
What is the relationship between nPr and nCr?
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nPr = nCr × r!
Permutations (nPr) equal combinations (nCr) multiplied by the factorial of r, representing the number of ways to arrange r selected objects.
What is 0! defined as?
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1
By mathematical definition, 0! is defined as 1, which helps maintain consistency in factorial calculations.
In the formula nCr, what does 'r' represent?
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Number of objects being selected
In the combination formula nCr, 'r' represents the number of objects being selected from a total of 'n' objects.
What does the multiplication principle help us calculate?
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Total number of ways multiple independent events can occur
The multiplication principle helps calculate the total number of ways multiple independent events can occur by multiplying the number of ways each event can happen.
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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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