The least number which should be added to 1789 so that the sum is exactly divisible by 5, 6, 4 and 3 is?
Choose one:  A) 1  B) 11  C) 21  D) 31  E) 41

Rationale: l . c . m . of 5 , 6 , 4 and 3 = 60 . on dividing 1789 by 60 , the remainder is 49 . number to be added = ( 60 - 49 ) = 11 b )
Answer: B