A stack of bricks is arranged so that the first layer has 120 bricks
MATHEMATICS · Subjective · A Level · Mathematics · Sequences and series · Sequences and series
Problem
A stack of bricks is arranged so that the first layer has 120 bricks, the second layer has 118 bricks, the third has 116 bricks, and so on. Explain why the number of bricks in successive layers forms an arithmetic progression and state its common difference.