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Selection: Permutations & Combinations Video Lecture | General Aptitude for GATE - Mechanical Engineering
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FAQs on Selection: Permutations & Combinations Video Lecture - General Aptitude for GATE - Mechanical Engineering
| 1. What is the difference between permutations and combinations? |  |
Ans. Permutations refer to the arrangement of objects in a particular order, while combinations focus on the selection of objects without considering the order.
| 2. How do you calculate the number of permutations? | |
Ans. The number of permutations can be calculated using the formula: n! / (n - r)!, where n represents the total number of objects and r represents the number of objects being arranged.
| 3. What is the formula for calculating combinations? | |
Ans. The formula for combinations is nCr = n! / (r! * (n - r)!), where n represents the total number of objects and r represents the number of objects being selected.
| 4. In how many ways can you arrange a set of 5 objects? | |
Ans. If you have a set of 5 objects, the number of permutations can be calculated as 5! = 5 x 4 x 3 x 2 x 1 = 120 ways.
| 5. How many different combinations can be formed from a set of 6 objects choosing 3 at a time? | |
Ans. Using the combination formula, the number of combinations from 6 objects choosing 3 at a time can be calculated as 6C3 = 6! / (3! * (6 - 3)!) = 20 ways.
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Dec 31, 2024 Last updated |
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