19taking this example,,,,,,,,,you use (C) when the people cannot be distinguished and (P) when the people are distinct!
When to take permutation and when combi ? Suppose there are 11 places and 7 people have to be distributed in these places. How many ways ? Pls explain.
Also pls explain the prime difference between permu and combi and when to be aware of their use ?
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4 Answers
3http://books.google.com/books?id=MvwUYveq12AC&pg=PT1163&dq=tmh+maths+for+iitjee#v=onepage&q=&f=true
1Please provide an easy explanation yaar...........i'm a beginner
1use permutation when there is selection+arrangement
use combination when there is only selection
7 ppl can be distributed in 11 places in 11p7 ways.it matters if people change their seats
a team of 11 ppl can be selected from 15 in15c11 ways .it doesnt matter if you change order
now is it that an easier explanation
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