test the divisibility of 11.
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divisibility of 11 is that the difference of the sum of the digits at odd places and even places should be divisible by 11
for instance:
121(divisibility by 11)
odd places=1 and 1 (sum = 2)
even place=2
difference=2-2=0
11*0=0
therefore no is divisible by 11
for instance:
121(divisibility by 11)
odd places=1 and 1 (sum = 2)
even place=2
difference=2-2=0
11*0=0
therefore no is divisible by 11
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