Question

Number of rectangles in fig. shown which are not squares is

• A. 159
• B. 160
• C. 161
• D. None

Answer 1

Answer: (B)

160

Answer 2

Total number of rectangles

= ⁷C₂ × ⁵C₂ – No. of squares

= 210 – No. of squares

\ Number of squares

= 24 + 15 + 8 + 3 = 50

Æ Æ Æ Æ

\binom { 1 \times 1 } { area } $\left( \begin{aligned} & 2 \times 2 \\ & area \end{aligned} \right)$ \binom { 3 \times 3 } { area } $\left( \begin{aligned} & 4 \times 4 \\ & area \end{aligned} \right)$