What will be the number at the bottom, if 5 is at the top; the two positions of the dice being as given below:

A) 1

B) 2

C) 3

D) 6

Answer: B) 2

Explanation:

From figures (i) and (ii), it is clear that 4, 1, 3 and 6 he adjacent to 2. Therefore, 5 must lie opposite 2. Thus, if 5 is at the top, then 2 must be at the bottom.