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h v Grade: 12
```        dear sir/madam, i am having doubt in the following question for some  time now and iit is on 11th ,so please help...!
"In how many ways 10 speakers can speak at a function such that A speaks before B and B speaks before C."
the answer is 10!/3!
i cannot understand how.Please help.```
7 years ago

## Answers : (2)

Priyansh Goel
21 Points
```										Follow these steps:
1.  Select A,B,C from 10 people in 10C3 ways.
2.   Arrange A,B,C in only 1 way. AS Ais before B and Bis before C.
3.   All others remaining can be permuted in 7! ways.

So, total : 10C3 *1*7!.
Solve this to get ur answer.

```
7 years ago
h v
33 Points
```										thanks for the answer
```
6 years ago
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