Lecture 5.6 - Permutations and Combinations - Applications
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- Опубликовано: 30 сен 2024
- Permutations and Combinations - Applications
Prof. Usha Mohan
Department of Management Studies
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at 11:24.......see.....first i select the captain by 40 C1=40 ways.....so now i have 39 students....from these 39....i will select my vice captain in 39 C1= 39 ways....so total no. of ways =39 * 40 which is 1560 ways.....does it work everytime both ways....(i.e) using permutation or combination?
Yes, your method (though a bit tedious but logically correct) will work both in Permutation and Combination.
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Done
What should we do if the question has indistinct circular permutations???
n-1 factorial divided by 2, as the objects are indistinct clockwise and anticlockwise direction are same
There is already one question in the last exercise
@@sayantaniray2213 I disagree with this. If all the objects are indistinct, then there will be just one way of arranging them.
@@mysticstranger666 yes that's y divided by 2
@@sayantaniray2213 I mean total value of combination should be equal to 1. In how many other ways can we rearrange the same looking beads.