Which of the following numbers is NOT divisible by 11?

Question

Accepted Answer

To check divisibility by 11, subtract the sum of digits in odd positions from the sum of digits in even positions. If the result is 0 or divisible by 11, the number is divisible by 11.

1. 109153
   Odd positions: 1 + 9 + 5 = 15
   Even positions: 0 + 1 + 3 = 4
   Difference = 15 - 4 = 11 (divisible by 11)

2. 5445
   Odd positions: 5 + 4 = 9
   Even positions: 4 + 5 = 9
   Difference = 9 - 9 = 0 (divisible by 11)

3. 80124
   Odd positions: 8 + 1 + 4 = 13
   Even positions: 0 + 2 = 2
   Difference = 13 - 2 = 11 (divisible by 11)

4. 128041
   Odd positions: 1 + 8 + 4 = 13
   Even positions: 2 + 0 + 1 = 3
   Difference = 13 - 3 = 10 (not divisible by 11)

Therefore, 128041 is NOT divisible by 11.

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