InterviewSolution
Saved Bookmarks
| 1. |
Three are 6 different flags. Find the number of signals which can be formed with the help of at least 3 flags. |
|
Answer» No. of flag required for one signal =3 or 4 or 5 or 6. Now number of ways to fill 3 places from 6 flags `= 6 xx 5 xx 4 = 120` Similarly, No. of signals containing flags `= 6 xx 5 xx 4 xx 3 = 360` No. of signals containing 5 flags `= 6 xx 5 xx 4 xx 3 xx 2 = 720` No. of signals containing 6 flags `= 6 xx 5 xx 4 xx 3 xx 2 xx 1 = 720` Total flags `= 120 _ 360 +720 +720 = 1920`. |
|