Question

How many cubes will have only a two surfaces painted with red and blue colour respectively?

• A. 8
• B. 12
• C. 24
• D. 30

Answer 1

Answer: (B)

12

Number of cubes with only two surface painted with red and blue colour respectively = Number of cubes present at 4 edge + Number of cubes present at 4 corner
= 4 x (n - 2) + 4 = 4 x (4 - 2) + 4 = 8 + 4 = 12
Here n = $\frac{sideofbigcube}{sideofsmallcube}=\frac{4}{1}=4$