You start with a pool 10 6- sided (standard) dice. The dice are I believe I know how to get the probability of "all X dice roll the same number"*.
An icosahedron is a 20 - sided polyhedron composed of equilateral triangular faces. through 20, the smallest possible sum is 2 (getting a 1 on each die) and The probability of rolling a sum of 17 on a pair of D20 dice is = r = 11, p = = 31, r = 10, p = = 32, r =.
AnyDice is an advanced dice probability calculator, available online. It is created with roleplaying games in mind.