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Introduction: Permutations and Combinations Video Lecture | General Aptitude for GATE - Mechanical Engineering
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198 videos|165 docs|152 tests
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FAQs on Introduction: Permutations and Combinations Video Lecture - General Aptitude for GATE - Mechanical Engineering
| 1. How do permutations differ from combinations? |  |
Ans. Permutations refer to the arrangement of objects in a specific order, while combinations refer to the selection of objects without considering the order.
| 2. What is the formula for calculating permutations? | |
Ans. The formula for permutations is nPr = n! / (n-r)!, where n is the total number of objects and r is the number of objects being arranged.
| 3. How do you calculate combinations? | |
Ans. The formula for 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. In how many ways can you arrange the letters in the word "APPLE"? | |
Ans. There are 5 letters in the word "APPLE," so the number of permutations is 5! = 120 ways.
| 5. If you have 10 different books and can only choose 3 to read, how many different combinations of books can you select? | |
Ans. Using the combination formula, there are 10C3 = 120 different combinations of books that can be selected.
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Nov 24, 2024 Last updated |
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