Math: can anyone help me with this - really difficult(logic type)

http://www.admissionstests.cambridgeasse…

the problem with question 23 is:

when i read it, try to approach it logically and select the data i need, and apply what i know to what the question wants me to do, i meet a road block

i do not know or understand what the question is asking me, what it means, or how the data is relevant at all

can anyone please assist me?

thanks

no calc allowed, to be done under 2 minutes.

since the 4th and 5th digits are for dates, and they are 31 for all the choices, it is obvious that this question is asking you to count for which sample is taken in a month that does not have 31days in it. choice 1 is 254 for first 3 digits, since 001 is june, any multiple of 12 + 1 is june. 254 = 252+1+1, and is thus the month of july which has 31 days, which is not the correct choice.

you know what to do.

(note: summing the numbers of choice one will yield a number that is a multiple of 10, taking a quick glance at the other choices, they all have the same number except 2 numbers, which one of them will plus one and the other will minus one fir each choice, so its obvious that they all are sum up to multiples of 10, so its just a trap to waste your time actually.)

E's digits sum is not a multiple of 10