Video narration
If your answer looks correct in one RRB syllogism diagram, don't mark it immediately. A conclusion can fit one arrangement and still fail in another. That is only a possibility, not a guarantee. ALL A are B means every member of A belongs to B: A is inside B. But remember, this direction does not reverse; it does not mean all B are A. SOME A are B means at least one member is in both A and B. It does not mean most or all overlap. Now the important turn: a conclusion is accepted only if it stays true in every possible diagram allowed by the statements. If it works once but breaks elsewhere, it does not follow. Keep this rule: ALL is inside, SOME is one common member, and certainty means true in every possible diagram. That is the exam-safe check.