SOLUTION: There are 4 students attending a test and 7 teachers available for checking the tests. Each student's test is checked by exactly one of these teachers, with each teacher being eq

Algebra ->  Permutations -> SOLUTION: There are 4 students attending a test and 7 teachers available for checking the tests. Each student's test is checked by exactly one of these teachers, with each teacher being eq      Log On


   

Question 1135585: There are 4 students attending a test and 7 teachers available for checking the tests.
Each student's test is checked by exactly one of these teachers, with each teacher being equally likely to be the one who checks the test.
The probability that all the 4 papers are checked by exactly 3 teachers is equal to k(6/7)^2.
Found 2 solutions by ikleyn, kohkche:
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

In this post, I see only statements, but do not see a question.

What do you want from us, the tutors ?

For what reason your post was submitted to the forum ?

Should we guess your question ?


/\/\/\/\/\/\/\/

After my questions, the condition to this problem was fixed and the problem was solved under this link

https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.1135588.html

https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.1135588.html




Answer by kohkche(3) About Me  (Show Source):
You can put this solution on YOUR website!
k = 35/72( Thanks to Ikelyn ).