Question

The number of rectangles which can be formed on a chessboard is –

• A. 81
• B. 1296
• C. 648
• D. 324

Answer 1

Answer: (B)

1296

Answer 2

9 horizontal and 9 vertical lines on a chess board,

⁹C₂ × ⁹C₂

= 36 × 36 = 1296