alleryStart learning →Raymond Smullyan made which kind of puzzle popular?
ADoctors and nurses
BKings and queens
CPilots and sailors
DKnights and knaves
Answer & Solution
Correct answer: D. Knights and knaves
Smullyan popularised puzzles in which knights always tell the truth and knaves always lie.
Keep practising Logic Puzzle
Browse all Logic Puzzle questions for Olympiad (Class 5), or explore more Reasoning topics.
Related questions
In a magic square, which lines must all add up to the same sum?Magic squares date back to at least 190 BCE in which country?One row of a magic square adds up to 15. What does each column add up to?Can 1, 2, 3 and 4 fill a 2x2 grid so all rows, columns and diagonals have equal sums?Which number sits in the centre of a normal 3x3 magic square made from 1 to 9?In a 3x3 magic square with constant 15, a row reads 8, blank, 6. Which number fills the blA normal 3x3 magic square uses the numbers 1 to 9 once each. What is its magic constant?A mini sudoku grid with 4 rows and 4 columns is divided into boxes of which size?