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Counting: Permutations & Combinations Video Lecture | CSAT Preparation - UPSC

208 videos|138 docs|138 tests
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00:08 Introduction
00:57 Counting: Basics of Permutation & Combination
01:00 Question 1
02:00 Question 2
06:00 Question 3
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FAQs on Counting: Permutations & Combinations Video Lecture - CSAT Preparation - UPSC

1. What is the difference between permutations and combinations?
Ans. Permutations refer to the arrangement of objects in a specific order, while combinations are selections of objects without considering the order.
2. How do you calculate the number of permutations of a set of objects?
Ans. The number of permutations of a set of objects can be calculated using the formula n! / (n-r)!, where n is the total number of objects and r is the number of objects being arranged.
3. What is the formula for calculating combinations?
Ans. The formula for calculating combinations is nCr = n! / (r! * (n-r)!), where n is the total number of objects and r is the number of objects being selected.
4. When should permutations be used instead of combinations?
Ans. Permutations should be used when the order of the objects matters, such as arranging students in a line for a performance. Combinations should be used when the order does not matter, such as selecting a group of students for a project.
5. Can you provide an example of a real-world application of permutations and combinations?
Ans. One example of a real-world application is in password creation, where the order of characters matters (permutation) but the specific characters chosen do not (combination).
208 videos|138 docs|138 tests
Video Timeline
Video Timeline
arrow
00:08 Introduction
00:57 Counting: Basics of Permutation & Combination
01:00 Question 1
02:00 Question 2
06:00 Question 3
More
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