alleryWhich kind of sum is used to test divisibility by 11?
ASum of the last two digits
BPlain sum of digits
CAlternating sum of digits
DProduct of the digits
Answer & Solution
Correct answer: C. Alternating sum of digits
1. Start from one end and add and subtract digits in turn.
2. If this alternating sum is divisible by 11, so is the number.
3. A plain digit sum is used for 3 and 9, not 11.
_Source: Wikipedia, Divisibility rule, section Divisibility by 11_
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