MdN

Definition
MdN is defined as a sum of M results of throwing die with N faces (the result of throwing is obviously a number of points on the top face). The result is a random number in range M to M*N, however its distribution is non-linear. The name means M dice with N faces

Explanation
Role playing games often used dice to get character attributes, such as Might or Wizdom, or to get random damage value, etc. In such cases not only a cubic die is used, but also dice with different number of faces. The MdN convenience let instead throw two dice with 4 faces just say throw 2d4

How to calculate in GM
In Game Maker there are 2 functions that have random effect. Their names are random and choose. Using random, we can define script MdN in such way: // argument0 is M (integer) // argument1 is N (integer) {  var res; res = argument0; repeat(argument0) res += floor(random(argument1)); return res; } Note that we can not achieve the same result with choose. However, it may be used differently: ... // throw 2d4 damage = choose(1,2,3,4)+choose(1,2,3,4); ...
 * 1) define MdN