Three regular dice are stacked one upon the other. The dots on each pair of touching sides add up to 5 and the face on the top of the stack shows an odd number of dots. Given that the dots on each pair of opposite faces on each die add up to 7, how many dots are on the face at the bottom of the stack?
6
bottom dice has 6 dots on the face at the bottom of the stack,1 dot on its top
middle dice has 4 on its bottom, 3 on its top
top dice has 2 on bottom , 5 on top