Which of the following number is neither divisible by 9 nor by 11?
Show answer & explanation
Correct answer: A
Explanation
Divisibility by 9 → Sum of digits is divisible by 9
Divisibility by 11 → (Sum of digits at odd places − Sum of digits at even places) is divisible by 11
3472 →
Sum of digits = 3+4+7+2 = 16 (Not divisible by 9)
(3+7) − (4+2) = 10 − 6 = 4 (Not divisible by 11)