If *381 is divisible by 11, then the digit at tae place of *is
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let the no. be x
for a number to be divisible by 11
Difference of the sum of its alternative numbers should be divisible by 11.
>>
x + 8 - (3+1) should be divisible by 11
x + 4 should be divisible by 11
>> x = 7,
since 7+4= 11 is divisible by 11
for a number to be divisible by 11
Difference of the sum of its alternative numbers should be divisible by 11.
>>
x + 8 - (3+1) should be divisible by 11
x + 4 should be divisible by 11
>> x = 7,
since 7+4= 11 is divisible by 11
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