Much more is needed to be known about the die.

Assumingthings like all sides are equally likely, the sides are numbered 1 through to 29 etc. etc., then the probability of rolling a 1 or a 2 in a single roll of the die is obviously 2/29.

(From your blind application of a well known formula it appears that you think that in a single roll it's possible for both a 1 and a 2 to appear ....)