IBPS Syllogism and Logical Reasoning 3

Question 1

Statements: All politicians are leaders. Some leaders are honest. Conclusions: I. Some politicians are honest. II. Some honest people are leaders. Which conclusion(s) follow?

Accepted Answer

Only II follows

Answer

The middle term 'leaders' is undistributed in both premises so Conclusion I is invalid; Conclusion II is a valid conversion of the second premise.

Question 2

Pointing to a photograph, Raj says, 'She is the daughter of my grandfather's only son.' How is the girl related to Raj?

Accepted Answer

Sister

Answer

My grandfather's only son is my father, so his daughter is Raj's sister.

Question 3

Statements: No clouds are rains. Some rains are floods. Conclusions: I. Some floods are not clouds. II. No rain is a cloud. Which conclusion(s) follow?

Accepted Answer

Both I and II follow

Answer

Conversion of 'No clouds are rains' gives 'No rain is a cloud'; some rains are floods and no rain is a cloud means some floods are not clouds.

Question 4

If 'A + B' means A is mother of B, 'A – B' means A is brother of B, and 'A × B' means A is father of B, what does P × Q + R mean?

Accepted Answer

P is grandfather of R

Answer

P × Q means P is father of Q; Q + R means Q is mother of R; so P is the grandfather of R.

Question 5

Statements: All teachers are graduates. All graduates are educated. Conclusions: I. All teachers are educated. II. Some educated people are teachers. Which conclusion(s) follow?

Accepted Answer

Both I and II follow

Answer

Chaining both universals gives all teachers are educated; converting this gives some educated are teachers.

IBPS - Institute of Banking Personnel Selection Practice Test

IBPS - Institute of Banking Personnel Selection Practice Test

IBPS Syllogism and Logical Reasoning 3