Multiple choice general knowledge math & puzzles

1,1,10,11,101,1000,1101,?

  1. 10111

  2. 11001

  3. 10101

  4. 11011

  5. 11110
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series represents Fibonacci numbers in binary: 1→1, 1→1, 2→10, 3→11, 5→101, 8→1000, 13→1101. The next Fibonacci is 21, which is 10101 in binary. The sequence is Fₙ=1,1,2,3,5,8,13,21...

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