Practice30Create account

Statements: All keys are locks. Some locks are doors. Conclusions: I. Some keys are doors.
II. Some doors are locks. Which conclusion(s) logically follow?

Competition practiceSyllogism
  • AOnly conclusion I follows
  • BBoth conclusions follow
  • CNeither conclusion follows
  • DOnly conclusion II follows

Step-by-Step Solution

The locks that are doors need not be keys, so I is not certain. 'Some locks are doors' directly gives 'some doors are locks' (II). Only II follows.
Answer: D) Only conclusion II follows

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Syllogism practice questions

More Syllogism practice

Statements: Some cups are plates. Some plates are bowls. Conclusions: I. Some cups are…Statements: All cats are dogs. All dogs are animals. Conclusions: I. All cats are…Statements: Some pens are books. All books are papers. Conclusions: I. Some pens are…Statements: No apple is an orange. All oranges are fruits. Conclusions: I. Some fruits…Statements: All roses are flowers. Some flowers are red. Conclusions: I. Some roses are…