Check the answer below:
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This riddle appears in Sophocles’ Oedipus Rex when the main character has to give the right answer to the Sphinx to save his life an continue the journey to Thebes. The monster asks: “What walks on four feet in the morning, two in the afternoon and three at night?”
Answer: “Man: as an infant, he crawls on all fours; as an adult, he walks on two legs and; in old age, he uses a ‘walking’ stick.”