Rules for valid categorical syllogisms – UGC NET Question

Statements A, B, C, E and F are correct, while D is false. A states the three-term rule, and B correctly links negative premises to a negative conclusion. C expresses the rule that two particular premises yield no valid conclusion, and E notes the prohibition on illicitly distributing a term in the conclusion. Venn diagrams are indeed useful in UGC NET to visualise these constraints. D is wrong because many valid moods, such as Barbara, have two universal premises and a valid universal conclusion. Therefore A, B, C, E and F only is the correct combination.

Option A:
Option A is incomplete because it omits E and F, ignoring both the rule about illicit distribution and the exam technique for testing syllogisms. While A, B and C are correct, leaving out these two elements makes the account less complete. Hence A, B and C only cannot be accepted.

Option B:
Option B is also incomplete, since it includes E but omits F, failing to mention the practical Venn diagram method. Although A, B, C and E are true, they do not fully address how validity is tested in UGC NET contexts. Therefore A, B, C and E only is not the best answer.

Option C:
Option C is wrong because it omits A and includes only B, C, E and F. Without A, the crucial three-term rule is not mentioned, which is essential for understanding many fallacies. This omission prevents the option from reflecting all the true statements given.

Option D:
Option D is correct because it gathers A, B, C, E and F, giving a comprehensive summary of structural rules and testing methods, while excluding D, which incorrectly claims that universal premises cannot yield a valid conclusion. This option therefore matches established syllogistic theory.