RRB NTPC · Question 27
Direction: There are three statements which are followed by three conclusions. Choose the conclusions which logically follow from the given statements. Statements: All the doors are keys. All the keys are bats. Some clocks are bats. Conclusions: (1) Some bats are doors (2) Some clocks are keys (3) All the keys are doors A.Only (1) and (2) B.Only (1) C.Only (2) D.Only (1) and (3)
Show answer & explanation
Answer: (B) B
Explanation
All doors are keys and all keys are bats, so all doors are bats, which means some bats are doors; (1) follows. Only some clocks are bats, so nothing links clocks to keys; (2) fails. 'All keys are doors' reverses 'all doors are keys', so (3) fails. Only (1) follows.