Index Formula:
Array: is a range of cells or an array constant.
If array contains only one row or column, the corresponding row_num or column_num argument is optional.
If array has more than one row and more than one column, and only row_num or column_num is used, INDEX returns an array of the entire row or column in array.
Row_num : Selects the row in array from which to return a value. If row_num is omitted, column_num is required.
Column_num : Selects the column in array from which to return a value. If column_num is omitted, row_num is required.
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