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The num ber of ways in whic h 8 exam ination papers be arranged so that the best and worst papers never come together.
  • a)
    8! - 2× 7! 
  • b)
     8! - 7!
  • c)
    8!
  • d)
    7!
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The num ber of ways in whic h 8 exam ination papers be arranged so tha...
The number of ways to arrange 8 examination papers without any restrictions is 8!.

To find the number of ways in which the best and worst papers never come together, we can treat them as a single entity. So, we have 7 entities to arrange: (best and worst papers combined), paper 2, paper 3, paper 4, paper 5, paper 6, paper 7, and paper 8.

The number of ways to arrange these 7 entities is 7!.

However, within the best and worst papers entity, we can arrange them in 2! ways.

So, the number of ways in which the best and worst papers never come together is 7! * 2!.

Therefore, the answer is 8! - (7! * 2!).
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The num ber of ways in whic h 8 exam ination papers be arranged so that the best and worst papers never come together.a)8! - 2× 7!b)8! - 7!c)8!d)7!Correct answer is option 'A'. Can you explain this answer?
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