IN EXCEL VBA:

Write an event handler when activating the zd sheet, put a msgbox saying "Hello You just activated worksheet 2* 1. 2. Write a function that takes 2 ranges as input and gets the sum of absolute difference of every element if there two ranges have the same numbers of elements the function can send eror message to user if the size of these two ranges are different the function can take not only 2 ranges but also two arrays as input