Discussion :: Cube and Cuboid - Cube and Cuboid 5 (Q.No.1)
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The following questions are based on the information given below:
All the opposite faces of a big cube are coloured with red, black and green colours. After that is cut into 64 small equal cubes.
|Sanjay said: (Jun 20, 2010)|
|Please explain me about this.|
|Rohit said: (Nov 1, 2011)|
|It should be 24 (12 on each side).|
|Jjjjj said: (May 22, 2012)|
|Total no.of blocks with green color=32
one face green and other one is either red or green is:32-8(corner blocks which are 3 face colored)-8(blocks with only one face green colored)=16.
|Mayank said: (Jun 24, 2014)|
|Question is asking, the cubes which have one face green and other face either red or black (it will not include the cubes which have both red and black faces along with green face i.e. eight cubes at the corner will also be excluded).
Answer is 16. i.e. 8+8.
|Nsk said: (Aug 30, 2014)|
|Friends I have one doubt any formula is there for identifying no of cubes have 2 faces painted black?|
|Spgandau said: (Jul 4, 2015)|
|The logic which does NOT include the corners is faulty. The question asks for cubes that have "black or red". It does not specifically exclude the corners which happen to have both black and red.
The logic of "OR" is correctly applied to the corners. They have black or red coloring. The correct answer then gives 12 surfaces on each face x 2 = 24. Please give reference material that would exclude the corners in such logic.
|Ashlesh said: (Sep 22, 2016)|
|It should be 12 on each side.
|Shah Hemish said: (Dec 25, 2018)|
|Please explain me the answer.|
|Gagan said: (Aug 30, 2020)|
|16 is correct because question said either black or red NOT Both so edges will be excluded as two green faces are there.|
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