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Determination of Significant Digits in a Number

How many smal...

Question

How many smaller cubes have all the surfaces uncoloured ?

A

0

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B

9

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C

18

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D

27

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Solution

The correct option is D 27
Smaller cubes with no surface colored will be present inside the cube
$= {(n - 2)}^{3}$
$= {(5 - 2)}^{3}$
$= {(3)}^{3}$
$= 27$

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