1. Given a number K and an array, find a pair of elements whose sum is equal to K.
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5. GCD Sum Problem Statement Given an integer 'N', the task is to find the sum of the greatest common divisor (GCD) of all pairs (i, j) such that 1 <= i < j <= N. Input: T (the number of test cases) For each test case:N (an integer) Output: An integer representing the sum of GCD of all pairs of numbers from 1 to N. A new line for each test case. Example: Input: T = 1N = 3 Output: 3 Explanation: For N = 3, the pairs are (1, 2), (1, 3), and (2, 3). The GCDs are 1, 1, and 1 respectively; sum is 3. Constraints: 1 <= T <= 5 1 <= N <= 5000 Note: You do not need to perform input/output operations as it has been handled. Implement the function and return the result.
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