If there are 9 horizontal lines and 9 vertical lines in a chess board, how many rectangles can be formed in the chess board?	Choose the correct option
A) 1204 B) 1296 C) 1340 D) 1754 E) 1674
Number of rectangles that can be formed by using m horizontal lines and n vertical lines   = mC2 × nC2   Here m = 9, n = 9   Hence, number of rectangles that can be formed   = mC2 × nC2   = 9C2 × 9C2 = (9C2)2   =(9×82×1)2=362=1296=(9×82×1)2=362=1296   ANSWER 1296 1296
<result>B</result>
If there are 9 horizontal lines and 9 vertical lines in a chess board, how many rectangles can be formed in the chess board?