In the interactive figure, enter a 0 in place of the "?" in the spreadsheet on the right if there is [b]no[/b] directed path from the first vertex to second vertex. Enter a 1 in place of the "?" in the spreadsheet on the right if there [b]is [/b]a directed path from the first vertex to second vertex.[br][br]When you have replaced all the "?", click on the "Check Answer" button. Correct entries will be colored [b][color=#00ff00]GREEN[/color][/b] and incorrect entries will be colored [b][color=#ff0000]RED[/color][/b].