50 REVERSE SYLLOGISM QUESTION HIGH LEVEL FOR IBPS PO MAINS 2017 AND CLERK PRE & MAINS also for RRB

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disjunctive syllogism is a valid rule of inference. If we are told that at least one of two statements is true; and also told that it is not the former that is true; we can infer that it has to be the latter that is true. If P is true or Q is true and P is false, then Q is true. The reason this is called “disjunctive syllogism” is that, first, it is a syllogism, a three-step argument, and second, it contains a logical dis junction, which simply means an “or” statement. “P or Q” is a dis junction; P and Q are called the statement’s disjuncture. The rule makes it possible to eliminate a dis junction from a logical proof. It is the rule that:

{\displaystyle {\frac {P\lor Q,\neg P}{\therefore Q}}}

Question 2 : All dials are mirrors
All mirrors are spoons
Some spoons are decks
Some decks are chairs
Conclusion 1 : Some decks are mirrors
Conclusion 2 : Some spoons are dials
Conclusion 3 : Some decks are dials
Conclusion 4 : Some chairs are spoons
Solution : 

• You can start with one conclusion at a time, find its parents and then apply combo rules.
• But if you look at it carefully: 3 out of 4 question statements are Particular Positive (PP). So if you pick any two of them, PP+PP=no conclusion.
• Fourth question statement is UP.  UP+PP=PP if this is intermediate conclusion, it won’t give any final conclusion when paired with any other question statement because PP + PP = no conclusion.
• If situation requires you to convert UP (=can only be converted into PP), then again PP+PP=no conclusion.
• So with that thought in mind, check four conclusion statement, you’ll see none of their parents can give conclusion.