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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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