Using divisibility test, determine whether the number 31790012 is divisible by 11 or not.
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no........................t
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Take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number.
3-1+7-9+0-0+1-2
2+7-9+0-0+1-2
10-9+0-0+1-2
1+1-2
2-2
0 ans .
As the difference between the sum of the digits at odd places and the sum of the digits at even places is O, therefore, 31790012 is divisible by 11.
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