Hard
Hard Logic Riddles
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The Fibonacci Modular

8,759 solved 51% solve rate 49% fail rate
What is the ones digit of the 100th Fibonacci number?
Only 51% solve this correctly
8,759 attempts
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Quick Answer & Explanation
5. The Fibonacci sequence

The answer to this riddle is 5. The Fibonacci sequence. Difficulty: Hard · Solved by 8,759 puzzle lovers.

5. The Fibonacci sequence ones digits repeat in a cycle of 60 (Pisano period for mod 10). The 100th position (100 mod 60 = 40) has ones digit 5.
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