**Objective:** Write an algorithm to find out whether in a given array there exists or not two numbers whose sum is exactly equals to a given number. This problem has been asked in Amazon and Microsoft interviews.

**Input:** An array arrA[], A number k

**Output:** True or false based upon we have found any two numbers in array arrA[] whose sum is equal to k

**Approach:**

**Method 1: Using Binary Search**

Read moreFind a pair of numbers from an array whose sum equals k