1985 AJHSME Problem 7
Problem
A "stair-step" figure is made of alternating black and white squares in each row. Rows through are shown. All rows begin and end with a white square. The number of black squares in the row is
In-depth Solution by BoundlessBrain!
Solution
Notice that in the th row, there are white squares and black squares. So, the row will have black squares.