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## #1 2015-06-02 09:12:08

### Combination:

**Question:**

In how many ways can 10 examination papers be arranged so that the best and the worst papers never come together?

**Option A):**

9*8!**Option B):**

8*8!**Option C):**

8*9!**Option D):**

7*9!

**Correct Answer is Option C):**

8*9!

**Explanation:**

No. of ways in which 10 paper can arranged is 10! Ways.

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 do not come together,

= 10!- 9!.2! = 9!(10-2) = 8.9!.

You cannot discover the new oceans unless you have the courage to lose the sight of the shore.

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## 2015-06-02 09:12:08

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