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Question
In how many ways 9 Mathematics papers can be arranged so that the best and the worst
i) may come together
ii) may not come together.
i) may come together
ii) may not come together.
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Solution
When the best and the worst papers come together, regarding the two as one paper, we have only 9 papers.
These 9 papers can be arranged in 9! Ways.
And two papers can be arranged themselves in 2! Ways.
No.of arrangement when best and worst paper not come together, =10!−9!.2!=9!(10−2)=8.9!.
These 9 papers can be arranged in 9! Ways.
And two papers can be arranged themselves in 2! Ways.
No.of arrangement when best and worst paper not come together, =10!−9!.2!=9!(10−2)=8.9!.
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