A hint to get started
Count products with their multiplicities before calculating moments
An unbiased regular tetrahedral die has faces 1,2,3,4. On throwing it onto a horizontal table, the face in contact with the table gives the number. Two such dice are thrown and X is the product of their numbers. Obtain the probability distribution of X, then derive
(i) ,
(ii) ,
(iii) .
[1982/II/11]
CJC · Discussion · Question 3
The 16 ordered die outcomes are equally likely; their distinct products are not.