NDA 2011
- Exam
- NDA
- Year
- 2011
- Subject
- Mathematics
- Chapter
- Permutation and Combination
NDA 2011 · Mathematics · Permutation and Combination
5 books are to be chosen from a lot of 10 books. If m is the number...
5 books are to be chosen from a lot of 10 books. If is the number of ways of choice when one specified book is always included and is the number of ways of choice when a specified book is always excluded, then which one of the following is correct?
Options
- A
- B
- C
- D
Correct answer
B.
Step-by-step solution
The correct answer is option (B).