This sequence puzzle was asked in the aptitude test for google. It is a popular interview question and has been asked in many other top interviews.

## Number Series Puzzle

**1, 11, 21, 1211, 111221, ………**

**What is the next number?**

Find the answer in the video or you can read it here.

#### What’s next in the series?

Can you think of the next term in the sequence. Write in comments.

#### Some more number series puzzles

**2, 5, 26, 677, ???**

**CAT Number Series Puzzle**

5+3+2 = 151022

9+2+4 = 183652

8+6+3 = 482466

5+4+5 = 202541

7+2+5 = **??????**

### Another Google Interview Question

The probability of spotting a truck on a highway in an hour is 0.999. **What is the probability of spotting a truck on that highway in 20 minutes?**