Question 1185646: There are 25 students. Four of these students are selected to attend four different conferences. The first student selected will go to a conference in Makati City, the second will go to Paranaque city, the third to Quezon city, and the fourth to Caloocan city. How many such selections are possible?
Answer by ikleyn(52781)   (Show Source):
You can put this solution on YOUR website! .
In this problem, we work with ordered subsets.
Therefore, the answer is 25*24*23*22 = 303600, the product of four integer numbers in descending order, starting from 25.
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See the lesson
- Special type permutations problems
in this site. Find there many solved similar problems.
Also, you have this free of charge online textbook in ALGEBRA-II in this site
- ALGEBRA-II - YOUR ONLINE TEXTBOOK.
The referred lesson is the part of this online textbook under the topic "Combinatorics: Combinations and permutations".
Save the link to this textbook together with its description
Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson
into your archive and use when it is needed.
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