**Objective :** You have been asked to Write an algorithm Find a Missing Number From a Sequence of Consecutive Numbers

**Input:** Array, arrA[] with a missing number and Range

**Output : **missing number

**Approach:**

- Approach is very simple, Add all the given numbers say S
- Calculate sum of N numbers by formula n(n+1)/2 , say N
- Find missing number m = N-S

Read moreFind a Missing Number From a Sequence of Consecutive Numbers