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All books are boards (A) + All boards are dusters (A) = All books are dusters (A) ⇒ Conversion ⇒ Some dusters are books (I), Hence, Ist doesn’t follow. All books are boards (A) ⇒ Conversion ⇒ Some boards are books (I), Hence, IInd doesn’t follow No book is a pencil (E) ⇒ Conversion ⇒ No pencil is a book (E) + All books are boards (A) ⇒ Some boards are not pencils(O*). Hence IIIrd follows. All boards are dusters (A) + No duster is an eraser (E) ⇒ No board is an eraser (E) ⇒ Conversion ⇒ No eraser is a board ⇒ I.I ⇒ Some erasers are not boards (O*). Hence IVth also follows. Alternate Method-
Four words have been given, out of which three are alike in some manner, while one is different. Select the odd word.
Four words have been given, out of which three are a like in some manner, while one is different. Select the odd word.
Four letter-clusters have been given, out of which three are alike in some manner, while one is different. Select the odd letter-cluster.
Find the odd words from the all the given alternatives.