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```        A and B stand in a ring with 10 others.if arrangement of 12 persons is at random then probability that there are exactly 3 persons between a and B is:

A)16/21
B)5/21
C)8/21
D)none```
8 years ago

Pratham Ashish
17 Points
```										Dear Varsha ,
ans for the above ques is (D) none of these.
this is becuse
1st we have to select 3 out of 10 persons...then arrange them randomly....then arrange other 7 n at last arrange given 2.....................and divide them by total no of possible arrangements(for circular permutation it is(n-1)!)
ans= 10C3 * 3!*7!*2/11! = 2/11
```
8 years ago
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