a. The second (ii) s.b. (iii).
b. (iii) "The decimal fraction of Z begins by a string 2016 " -sounds better than the present definition.
c. Both "and"s at the end of the first two statements do not belong to the statements, should be placed between (i) & (ii) and (ii) & (iii).
d. The period signs (.) at the sentences' ends are missing.
I wanted to change the title of my post, since the puzzle might be solvable even with the text as it is - but apparently this is not possible within the present system; - one of the long-existing bugs, constantly ignored.
Edited on August 30, 2016, 1:02 pm