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Miscellaneous: Combinations Video Lecture | CSAT Preparation - UPSC
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FAQs on Miscellaneous: Combinations Video Lecture - CSAT Preparation - UPSC
| 1. What is the concept of combinations in mathematics? |  |
| 2. How is the concept of combinations different from permutations? | |
Ans. Unlike combinations, permutations consider the order of elements. In permutations, the arrangement of the selected items is significant, whereas in combinations, only the selection matters, not the order.
| 3. How do you calculate the number of combinations for a given set? | |
Ans. The number of combinations can be calculated using the formula C(n, r) = n! / (r!(n-r)!), where n represents the total number of items in the set and r represents the number of items to be chosen.
| 4. Can you provide an example of a real-life application of combinations? | |
Ans. One example of a real-life application of combinations is in lottery games. When choosing a set of numbers, the order of selection does not matter, making it a combination. Calculating the odds of winning involves finding the number of possible combinations.
| 5. Is it possible to have repetitions in combinations? | |
Ans. No, combinations do not allow repetitions. Each element can only be selected once. If repetitions are allowed, it would be a different concept called combinations with repetitions or multisets.
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