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Step-by-step explanation:
a and b are digit and maximum value of digit is 9
(a +b)max=9+9=18
sum of a+b cannot exceed 18
2)dad=11(a+b)
dad is multiple of 11
3) (dad)max=11*(9+9)=11*18
=198
dad less than 198
4)110 ,121, 132,143,154,165,176,187,198
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