Answer :

The division is as follows:



Here when 7 is multiplied by 3b we get 21b as the result.


In division the sign of the product [divisor × quotient] is always inverted to get the final result.


So the sign of product should always be opposite to that of the dividend.


So 21b becomes perfectly divisible by 7 and hence the quotient is 3b and remainder is 0.


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