1) The number 311311311311311311311 is : A) divisible by 3 but not by 11 B) divisible by 11 but not by 3 C) divisible by both 3 and 11 D) neither divisible by 3 nor by 11 Answer: Option DExplanation:Sum of digits= 35 and so it is not divisible by 3. (Sum of digits at odd places)- (Sum of digits at even places)= 19-16=3, not divisible by 11. So, the given number is neither divided by 3 nor by 11.
