The number 311311311311311311311 is  Choose the correct option
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 E) None of these
Solution   311 is repeated seven times in the number, 311 is not divisible by 3 but 311 repeated twice is not divisible by 3, but divisible by 11.   Similarly 311 repeated thrice is divisible by 3, but not by 11.   As 311 is repeated seven times, which is neither multiple of 2 nor 3.   So, number is not divisible by 3 or 11. Answer neither divisible by 3 nor by 11
<result>D</result>
The number 311311311311311311311 is