Answer:
Given, \[\begin{align} & \,\,\,\,\,\,2\,\,\,\,a\,\,\,\,3 \\ & \underline{+\,\,\,3\,\,\,\,\,2\,\,\,\,6} \\ & \,\underline{\,\,\,\,5\,\,\,\,\,b\,\,\,\,9} \\ \end{align}\] Since, 5 b 9 is divisible by 9. So, (5 + b + 9) is divisible by 9. ½ So, clearly b = 4 and \[\left( 549-326\text{ }=223 \right)\]so, a =2 Thus, \[b-a\text{ }=4-2~~\] =2
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