Multiple choice Find the largest number of four digits which is exactly divisible by 21, 18, 12, 15. 8700 8810 8820 9930 None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation To find greatest which is divisible by 21, 18, 12 and 15, we shall have to find the LCM of 21-18-12-15 which is 1260. After dividing 9999 by 1260 we get 1179 remainder. So answer will be 9999-1179 = 8820