### Brain Teasers

# Infinitely Fun

What are the next three letters in this series?

C, A, D, A, E, I, B, F, __, __, __, ...

C, A, D, A, E, I, B, F, __, __, __, ...

### Hint

Remember, there's an ellipsis at the end!### Answer

E, C, EIf A = 1, B = 2, C = 3, etc., then the above series becomes:

3 1 4 1 5 9 2 6 5 3 5

Those numbers are the first digits of pi.

Hint: Because pi is irrational, this series is infinite, which is why there is an ellipsis at the end.

Hide Hint Show Hint Hide Answer Show Answer

## What Next?

**Solve a Similar Brain Teaser...**

Or, get a random brain teaser.

If you become a registered user you can vote on this brain teaser, keep track of

which ones you have seen, and even make your own.

## Follow Braingle!