Latest Infosys Aptitude Question SOLUTION: How to solve syllogism question in infofys test, there are six statements and followed by options.. each option consist combination of above any statements.

http://mrunal.org/2013/01/reasoning-syllogism-all-cats-dogs-approach-shortcut-technique-explained-ibps-ssc-csat-cat.html#1206

please refer https://www.youtube.com/watch?v=DyRo1_ZCLFU .

Syllogism problems with any finite number of premises can be solved by Transformed Raval notations method.In Transformed RAVAL NOTATION, each premise and conclusion is written in abbreviated form, and then conclusion is reached simply by connecting abbreviated premises.NOTATION: Statements (both premises and conclusions) are represented as follows: Statement Notation a) All S are P, SS-P b) Some S are P, S-P c) Some S are not P, S / PP d) No S is P, SS / PP (- implies are and / implies are not) All is represented by double letters; Some is represented by single letter. No S is P implies No P is S so its notation contains double letters on both sides. RULES: (1) Conclusions are reached by connecting Notations. Two notations can be linked only through common linking terms. When the common linking term multiplies (becomes double from single), divides (becomes single from double) or remains double then conclusion is arrived between terminal terms. (Aristotle’s rule: the middle term must be distributed at least once) (2)If both statements linked are having – signs, resulting conclusion carries – sign (Aristotle’s rule: two affirmatives imply an affirmative) (3) Whenever statements having – and / signs are linked, resulting conclusion carries / sign. (Aristotle’s rule: if one premise is negative, then the conclusion must be negative) (4)Statement having / sign cannot be linked with another statement having / sign to derive any conclusion. (Aristotle’s rule: Two negative premises imply no valid conclusion) Syllogism conclusion by Tranformed Raval’s Notation is in accordance with Aristotle’s rules for the same. It is visually very transparent and conclusions can be deduced at a glance,

Raval’s notations solves syllogism problems with any finite number of premises with ease. Consider following syllogism problem with six premises.
Statements: Notations
a.Some books are pens. B - Pe
b.All pens are pencils. Pe Pe- Pl
c.No pencils are copies. Pl Pl /CC
d.Some copies are not calculators. C / Ca Ca
e. All Pencils are toys. Pl Pl – T
f. All toys are blue TT – Bl

Conclusions:
1.Some books are blue. B - Bl
2. No books are copies. BB / CC x
3. No pens are copies Pe Pe / CC
4. Some pencils are not copies Pl / C

A) Only 3 follows B) Only 4 follows C) Only 1, 3 and 4 follow
D) All follow
E) None of these
Answer. C) Only 1, 3 and 4 follow