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# A regular octahedron has sides numbered 1, 3, 5, 7, 9, 10, 11, 12.

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A regular octahedron has sides numbered 1, 3, 5, 7, 9, 10, 11, 12. Another regular octahedron has sides numbered 2, 4, 6, 8, 9, 10, 11, 12. How many different sums can be obtained if these are thrown together, and the numbers on the top faces are added?

a) 18

b) 64

c) 15

d) 19

e) 17

Guest Dec 16, 2017

#1
+5922
+2

I don't know if this is the way you are supposed to do it, but here I made a table with all the different possible combinations, and highlighted each unique sum once:

I count  19  .

hectictar  Dec 16, 2017
Sort:

#1
+5922
+2

I don't know if this is the way you are supposed to do it, but here I made a table with all the different possible combinations, and highlighted each unique sum once:

I count  19  .

hectictar  Dec 16, 2017
#2
+80969
+1

Pefectly fine, hectictar.....!!!!

CPhill  Dec 16, 2017

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