Which number can come in place of question mark (?) ?

4 6 3 Cannot be determined

6

From option (I) & (II)           1  ––   2   ––   3           1  ––   4   ––   6 Thus, we get that, ‘2’  is opposite to  ‘4’ ‘3’ is opposite of  ‘6’ ‘1’ is opposite of  ‘5’ Look at the position I and IV carefully, two surfaces are common. Therefore, the question mark in the position IV will be replaced by ‘6’