3 ms·The more general test for eleven is to check that the alternating sum of the digits is zero.by sdenton4 11y agoThe more general test for eleven is to check that the alternating sum of the digits is zero.cousin_it 11y agoCounterexample: 209. The even more general test is that the alternating sum of digits is divisible by 11.sdenton4 11y ago(I'll pretend to defend myself and say I meant zero mod eleven. :) )