Permutation and CombinationHard
Question
The number of signals that can be made with 3 flags each of different colour by hoisting 1 or 2 or 3 above the other, is:
Options
A.3
B.7
C.15
D.16
Solution
Total number of signals can be made from 3 flags each of different colour by hoisting 1 or 2 or 3 above.
i.e. 3p1 + 3p2 + 3p3 = 3 + 6 + 6 = 15
i.e. 3p1 + 3p2 + 3p3 = 3 + 6 + 6 = 15
Create a free account to view solution
View Solution FreeMore Permutation and Combination Questions
All the 7 digit numbers containing each of the digits 1, 2, 3, 4, 5, 6, 7 exactly once and not divisible by 5 are arrang...The number of ways in which 3 different red, 3 different white and 3 different black balls can be arranged in a line suc...The total number of seven digit numbers the sum of whose digits is even is-...A bag contains 9 balls marked with digits 1,2,....,9. If two balls are drawn from the bag, then number of ways of gettin...The number of ways of arranging the letters AAAAA, BBB, CCC, D, EE & F in a row if no two ′C′s are together ...