Statements A, B, C and D correctly describe how “unless” is handled in logical translation, while E is false. “p unless q” can be read as “if not q then p”, and this in turn is equivalent to “p or q”, often represented with “or” and negation in symbols. Mishandling this connective, such as turning it into “if p then q”, leads to incorrect formalisation in exam problems. Therefore, the correct set includes A, B, C and D only.
Option A:
Option A is incomplete because it omits D, not acknowledging the exam-specific warning that mistranslating “unless” leads to errors. A, B, C only therefore does not fully address the question’s focus on UGC NET practice.
Option B:
Option B is wrong since it leaves out A, losing the general point that “unless” is captured using “or” and negation in symbolic notation. B, C, D only therefore presents only a partial description.
Option C:
Option C is correct as it includes the definitional, equivalence and exam-oriented statements while excluding E, which mistakenly equates “unless” with a one-way conditional. This combination matches standard treatments in logic textbooks.
Option D:
Option D is incorrect because it omits B and thus fails to mention the key equivalence “if not q then p”, central to understanding “unless”. A, C, D only therefore cannot be the right answer.
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