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A guard of `12` men is formed from a group of `n` soldiers. It is found that `2` particular soldiers `A` and `B` are `3` times as often together on guard as `3` particular soldiers `C, D` & `E`. Then `n` is equal toA. `28`B. `27`C. `32`D. `36` |
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Answer» Correct Answer - C `(c )` `.^(n-2)C_(12-2)=3.^(n-3)C_(12-3)` `implies.^(n-2)C_(10)=3.^(n-3)C_(9)` `implies(n-2)/(10)=3impliesn=32` |
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