There are many possibilities that can fit in a sequence or number series. The idea is to keep the mathematical operation, logic or intuition to the simplest. Solving these sequence puzzles will keep your brain in good shape and will also come handy if you appear in any of the competitive exams which take aptitude test.

### 1. Can you find the missing year in the following number series?

**1999, 2003, 2011, 2017, ????**

### 2. Can you find the missing numbers in the following pyramid?

**120**

**6, ?**

**3, 2, ?**

**?, 1, 2, ?**

### 3. Based on the following equations; Find the value of the next one!

If,

34 – 1 = 35

24 – 5 = 21

19 – 1 = 20

Can you find the value of

**11 – 1 = ?**

### 4. A simple number series. What comes next?

**8, 12, 24, 60, ?**

### 5. Find the missing number in this number series

**10, 14, 18, 11, 15, ?, 12, 16, 20, 13, 17, 21**

### 6. Find the next number in this number series?

**12, 13, 15, 17, 21, 23, ?**

### 7. Think-Out-of-the-box number series

**1, 4, 5, 6, 7, 9, 11, ?**

### Solve Google Interview Number Series

**1, 11, 21, 1211, 111221, ………**

You can find the solution here.

### More Puzzles and Series at,

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