Question

What is the greatest 4 digit number which is exactly divisible by 12, 18, 21 and 28?

• A. 9900
• B. 9828
• C. 9800
• D. 9200

Answer 1

Answer:

B. 9828

The largest four digit number = 9999 LCM( 12, 18, 21 and 28) = 252 9999 = 252 × 39 + 171 So the greatest 4 digit number which is exactly divisible by 12, 18, 21 and 28 = 9999 - 171 = 9828