What is the next number in the series: 1,1,2,3,5,8,13

Answer as guest — Start Free Practice Test to earn Practice PointsHow to earn pointsAsk a question+3Answer a question+1Someone answers yours+1Your Q gets upvoted+1Pioneer bonus (first 5)+51 point = ₹1 discount on purchases, ask questions & climb the leaderboard!

• A 15
• B 21
• C 18
• D 19

Submit Answer

Show answer and explanation

Answer: B. 21

This is the Fibonacci series: each number is the sum of the two before it. 5 + 8 = 13, so the next number is 8 + 13 = 21.

Answering after opening this box earns no Practice Points.