Thinking 4586

I'm thinking of a number that doesn't belong to the group. Please find it, justify the choice, and divide it by 9.

36,54,56,80,72,64,42,18,24,32,90,48,28,99.

Correct answer:

a =  99
b =  11

Step-by-step explanation:

a=99
b=a/9=99/9=11



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