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
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