This is a 5×5 grid. The first row from left to right contains the numbers 1, 2, 3, 4, and 5; the second row contains 6, 7, 8, 9, and 10; the third row contains 11, 12, 13, 14, and 15; the fourth row contains 16, 17, 18, 19, and 20 and the final row contains 21, 22, 23, 24, and 25. The number 17 is shaded and a line has been drawn through the fourth row and the second column, and the fifth row and the fourth column