In a library with an infinite number of books, how can you find one specific book among countless duplicates?
Category: Brain · Difficulty: hard
Hint: Think about how books can be categorized and identified.
Answer
Use a unique identifier for each book
Explanation
Using a unique identifier allows you to pinpoint a specific book even in an infinite collection.
This is a hard brain riddle — a tricky one that takes a little thought. The answer is Use a unique identifier for each book.
More Brain riddles
- What ticks without moving, counts without numbers, and never forgets a moment?
- I can be lost but never found, I can guide but never touch. What am I?
- I can be red, white, or black but am never seen alone. I am often found where decisions are made. What am I?
- I can be broken without being touched, and I can be built without any bricks. What am I?
- What number should replace the question mark? 2, 3, 5, 7, 11, ?
- What runs around the yard without moving?
- I can speak without a mouth and hear without ears. What am I?
- I speak without a mouth and hear without ears. I have no body, but I come alive with the wind. What am I?