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May 23rd, 2014, 10:00 PM   #1
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How many different structure possible with 4 cube

Hi

Four 1 unit cubes are joined face to face in all possible ways to form a structure. Two such structures are considered same if one can be obtained from another by rotation. How many different structure is possible to make?

I get the answer 5. But the answer is 8.

Thanks in advance
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May 24th, 2014, 12:03 AM   #2
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Math Focus: Geometry
1 means cube, 2 means 2 cubes one on the another.

(a) 1-1-1-1

(b) 1-1-1
___1

(c) 1-1
___1-1

(d) 1
___1-1
_____1

(e) 1-1-1
_____1

(f) 1-2
_____1

(g) 1-1
_____2


Option (g) has 2 variants, which you can't get one by rotating other.
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