A guard of 12 men is formed a group ...

A guard of 12 men is formed a group of n soldiers . It is found that 2 particular solders A and B are 3 times as often together on guard as 3 particular solders C,D,& E. Then n=

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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1B (COMBINATIONS )

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