### Want a Free Job Posting?

Buy a job posting today and the second one is on us. For a limited time only. Act Now.

Amazon.com

Engaged Employer

## Interview Question

Interview Hyderābād (India)

# How many smaller cubes are completely invisible in a n*n*n

rubic's cube?

3

n^3- 6n^2 The number of cubes are n^3(volume). The number of cubes exposing one or more sides( 6 *( n^2) - all cubes on the sides.) Number of invisible cubes are n^3- 6n^2 .

Vivekananda on Jun 7, 2012
2

Isn't the answer none since the question says "completely invisible"? every unit is visible by at least one side so any sub cube (made of these units) has a portion exposed.

luis on Jun 13, 2012
4

N*N*N-(N*N*2+N*(N-2)*2+(N-2)*(N-2)*2)

ram on Jun 13, 2012
11

(N-2)^3

Sofya on Jun 25, 2012
0

(n-2)^3 you can verify by assuming n=4. Try to visualize invisible cubes and compare it with answers.

Raj on Apr 28, 2014
2

(n-2)^3 you can verify by assuming n=4. Try to visualize invisible cubes and compare it with answers.

Raj on Apr 28, 2014