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Question

Using divisibility test, determine whether $$7138965$$ is divisible by $$11$$ or not. 


Solution

RULE: 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.
$$7-1+3-8+9-6+5=24-15=9$$
Since, 9 is not divisible by 11 so the Given number is not divisible by 11


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