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# 8.$$\;\;\begin{array} \hline \;\;\;A & 1\\ + 1 & B\\ \hline \;\;B & 0\\ \hline \end{array}$$

We have condition as:

B+1=0 i.e, B must be 9 to get 0 at unit's digit of the addition.So, we got B=9

Also we have A+1+1(carry)=B

$$\Rightarrow$$ A+2=9

$$\Rightarrow$$ A=7

Hence, we have A=7 and B=9