Hah... Just see how multiples of 16 and 17 are related re... When you divide consequtive multiples of 16 by 17, you get remainders like 16, 15, 14, 13, and so on till you get 0 at the LCM of 16 and 17, and then the cycle repeats. This cycle repeats after every 18 nos.
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Let\'s divide 64 (you know why 64) by 18 and we get a remainder of 10. Corresponding to this 10th place is the number 6 or 5 maybe from the above series of reminders... Phew!!! your answer is D - NONE - baba. Ek line ka question aur itna dimaag lagana pada... Kya hai yeh!