>>118913270 + 0 is 0
0 = a guess presented by the text(the rest is %chance@answr=0 /or %=rnd_0-3)
0 = one of the possibilities
0 has no effect on the chance to be wrong beyond being present but adds +1
to the otherwise 1/3rd scenario because its a possibility(making the problem 1/4th)
it would be 1/5th if the other 25 is accounted for in the selection but the question
is to guess at random between the answers presented, making the possibility of being correct
having to be dealt with by accounting for the numbers and percents available in the answers..
as well as the 0 presented by the text because its asking you to pick randomly between the answers
