InterviewSolution
Saved Bookmarks
| 1. |
If `^0P_5+5^9P_4=^(10)P_r ,`find the value of `rdot` |
|
Answer» `.^(10)P_(r )=.^(9)P_(5)+5^(9)P_(4)` `=(9!)/((9-5)!)+5xx(9!)/((9-4)!)` `=(9!)/(4!)+(9!)/(4!)` `=2xx(9!)/(4!)` `=(5xx2xx9!)/(5xx4!)` `=(10xx9!)/(5!)` `=(10!)/(5!)` `=.^(10)P_(5)` `implies r=5` |
|