If the statement 'No aeroplanes are electric vehicles' is given as true, then which of the following statements can be immediately inferred to be true?
AAll aeroplanes are electric vehicles
BSome aeroplanes are electric vehicles
CSome aeroplanes are not electric vehicles ✓ Correct
DSome aeroplanes are not non-polluting vehicles
Correct answer: (C) Some aeroplanes are not electric vehicles
Explanation
"Some aeroplanes are not electric vehicles" can be inferred true.
The given "No aeroplanes are electric vehicles" is an E proposition, taken true.
On the square, E is the superaltern of the O proposition.
By subalternation a true E yields a true O of the same terms.
Hence the O "Some aeroplanes are not electric vehicles" follows as true.
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