AP EAMCET · Maths · Permutation Combination
In how many ways can examination papers be arranged so that the best and the worst papers are never together?
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
The number of ways in which 9 papers can be arranged are 9! ways. Take Best and Worst papers as one unit then, 9-1!=8! The best and worst papers can arrange themselves in 2! ways. Total number of ways =9!-2!×8!
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