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Permutations and Combinations Quiz
Class XI
Mathematics
Permutations and Combinations
14 questions
EASY
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Preview questions
1. What is the formula for permutations of n objects taken r at a time?
n! / (n - r)! · n! / r! · r! / n! · n! + r!
2. How many ways can 3 books be arranged on a shelf?
6 · 3 · 9 · 12
3. What is the value of 5P2?
20 · 10 · 30 · 15
4. If n = 4, how many ways can we choose 2 objects from it?
6 · 4 · 8 · 2
5. What is the formula for combinations of n objects taken r at a time?
n! / [r!(n - r)!] · n! / (n - r)! · r! / n! · n! + r!
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