Breakdown of osoraku sore wa tadashii kotae de wa arimasen.
はwa
topic particle
それsore
that (one) pronoun
答えkotae
answer
正しいtadashii
correct; right
で は ありませんde wa arimasen
it is not the case
おそらくosoraku
probably, perhaps
Same degree of confidence as 多分, but more formal.
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