RRB NTPC · Question 16
How many rectangles are there in the given figure?
Show answer & explanation
Answer: (B) 36
Explanation
The figure is a 3 × 3 grid with 4 horizontal and 4 vertical lines. A rectangle needs 2 of each: C(4, 2) × C(4, 2) = 6 × 6 = 36.