How many distinct cases for the correct responses of the questions exist?

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Solution

The correct option is B
6

$\begin{matrix} Q u e s t i o n & R e s p o n s e s & (9 o f t h e m w i l l b e w r o n g) 1 & A & C D & \to T w o w r o n g . 2 & B & A B & \to A t l e a s t o n e w r o n g . 3 & C & A A & \to A t l e a s t o n e w r o n g . 4 & D & B C & \to T w o w r o n g . 5 & C & B B & \to A t l e a s t o n e w r o n g . 6 & A & C C & \to A t l e a s t o n e w r o n g . \end{matrix}$

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How many distinct cases for the correct responses of the questions exist?

The correct option is B 6QuestionResponses(9 of them will be wrong)1AC D→Two wrong.2BA B→At least one wrong.3CA A→At least one wrong.4DB C→Two wrong.5CB B→At least one wrong.6AC C→At least one wrong.