Question

The surface area of a cube of dimensions n x n x n is painted and it cut into n cubes of equal length (1 unit), then number of 2 faces painted cubes are :

a) 8(n - 2)
b) 6(n - 2)
c) 12(n − 2)
d) 4(n - 2)

ANSWER CORRECTLY​

Answer 1

Answer:

V(Big cube) = 216 × V (small cube)

A

3

=216a

3

(

216

A

)

3

=a

6

A

=a

Let side of Big cube = 6 unit

∴ side of small cube = 1 unit.

∴ zero side printed ⇒(n−2)

3

=(6−2)

2

=4

3

=64