In 5 objects in 5 position how is derangement of other 2 only matters when choosing only one correct. Doesn’t the other 4 matters.I also would like to know how can we get nine derangements.
The ans would be 0 if stated exactly 9 correct. But if the question stated “the probability she managed to get 9 correct” then the ans would be 1/10! na
CAT-holics 
In 5 objects in 5 position how is derangement of other 2 only matters when choosing only one correct. Doesn’t the other 4 matters.I also would like to know how can we get nine derangements.
Should have been other 4, hence the 9. Similarly previous line should have been “other 3”
regards
J
The probability she managed to get 9 right equals to getting 10 right should be 1/10!
The ans would be 0 if stated exactly 9 correct. But if the question stated “the probability she managed to get 9 correct” then the ans would be 1/10! na
But it IS stated that EXACTLY 9 correct is needed. So should be 0 only.
regards
J
EXACTLY 9 right…
regards
J