Question
Statements: Some pins are needles. All needles
are threads. No thread is a button. Conclusions: I. Some pins are not threads. II. Some needles are buttons. III. No pin is a button. IV. Some buttons are not pins. In each of the questions below are given three statements followed by four conclusions numbered I, II and III and IV. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of given conclusions logically follows from the given statements disregarding commonly known facts.Solution
Some pins are needles (I) + All needles are threads (A) ⇒ Some pins are threads (I). Hence, conclusion I will not follow. All needles are threads (A) + No thread is a button (E) ⇒ No needle is a button (E). Hence, conclusion II will not follow. Some pins are needles (I) + All needles are threads (A) ⇒ Some pins are threads (I) + No thread is a button (E) ⇒ Some pins are not buttons (O). Hence, conclusion III & IV will not follow.
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