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 Boundless Brain!
Solution
Notice that in the th row, there are
white squares and
black squares. So, the
row will have
black squares.