69 INTRODUCTION It has been estimated that more than 1 million deer-vehicle crashes (DVCs) occur each year in the United States, costing the traveling public more than $1 billion.1 Some of the countermeasures that have been applied to reduce DVCs include deer fencing, wildlife crossing structures, roadside reflectors, vehicle whistles, highway lighting and speed limit reductions.2–4 The install...

First solution: Pair each entry of the first row with the entry directly below it in the second row. If Alan ever writes a number in one of the first two rows, Barbara writes the same number in the other entry in the pair. If Alan writes a number anywhere other than the first two rows, Barbara does likewise. At the end, the resulting matrix will have two identical rows, so its determinant will ...