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Next number in the series will be 13.

**How?**

every number in this series is sum of previous two numbers, thus the next number should be 5 + 8 = 13.

This classic and very important series is called Fibonacci series.

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Next number in the series will be 13.

every number in this series is sum of previous two numbers, thus the next number should be 5 + 8 = 13.

This classic and very important series is called Fibonacci series.

fivebee says

13 because of fibonacci numbers