Small thing: the explanation of answer 4 reads: "This is almost correct except for the fact that sum should be declared of type OptionInt instead of Optional."
It should be: "This is almost correct except for the fact that sum should be declared of type OptionalInt instead of Optional."
About Question enthuware.ocpjp.v8.2.1888 :
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Re: About Question enthuware.ocpjp.v8.2.1888 :
Fixed.
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