(A) 6 (X)

(B) 9 (X)

**(C) 15 ()**

(D) 18 (X)

Answers: **Three flags each of different colours are available for a military exercise, Using these flags different codes can be generated by waving.
1 Single flags of different colours
2 Any two flag in a different sequence of colours
3 three flag in a different sequence of colours
The maximum number of codes that can be generated is 15.**