how do i finish writing this function in C?

trying out a practice for Coding in c gave me wrong first time for 4? is this correct?

Question 1 What is the output of the following code segment? 75 inti, ptr 1. 'ptr2: int arr|71 = [11, 22, 33, 44, 55, 66, 77 wer ptr 1 - &arr(21: Matrix ptr2 - &arr(4): ra for(i = ptr2-ptr1; i