Which one of the following number is divisible by 11?
- 7879553
- 7879593
- 8478551
- None of these
Explanation
A number is divisible by 11 if the difference between the sum of its digits in odd positions and the sum of its digits in even positions is a multiple of 11 (including 0).
For 7879553:
- Sum of odd-positioned digits = 7 + 7 + 5 + 3 = 22
- Sum of even-positioned digits = 8 + 9 + 5 = 22
- Difference = 22 - 22 = 0 (which is a multiple of 11)
Thus, 7879553 is divisible by 11.
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