Paper 1 · Logical Reasoning
UGC NET December 2023 (19.12.2023) Shift-II
Which of the following statements is equivalent to the statement 'Some philosophers are not idealists'?
ASome philosophers are not non-idealists
BNo idealists are philosophers
CSome non-idealists are not philosophers
DSome non-idealists are not non-philosophers ✓ Correct
Correct answer: (D) Some non-idealists are not non-philosophers — The equivalent statement is some non idealists are not non philosophers, so that is the answer.
Explanation
★The equivalent statement is some non idealists are not non philosophers, so that is the answer.
★The original is some philosophers are not idealists, a type O statement.
★Obversion and conversion transform a statement while keeping its meaning.
★Applying double negation to the terms preserves the original logical force.
★Some non idealists are not non philosophers restates the same relation.
★The other options change the logical type and are not equivalent.
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