What is the rarest dice roll?

What is the rarest dice roll? (Uspensky 1937, pp. 23-24). , and the least common rolls are 2 and 12, both with probability 1/36. For three six-sided dice, the most common rolls are 10 and 11, both with probability 1/8; and the least common rolls are 3 and 18, both with probability 1/216.

(Uspensky 1937, pp. 23-24). , and the least common rolls are 2 and 12, both with probability 1/36. For three six-sided dice, the most common rolls are 10 and 11, both with probability 1/8; and the least common rolls are 3 and 18, both with probability 1/216.