How does the following series continue? >< , <> , << , ][ , [] , [[ , )( , ...
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() , ))
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() , )(
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(( , ()
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() , ((
The pattern alternates between matching brackets/parentheses: >< (mismatched), <> (matched), << (both left), ][ (mismatched), , [[ (both left), )( (mismatched). The next two should be matched and both left: () and [[. Option A has )) which breaks the pattern. Option B has )( which is mismatched. Option C has (( which should come after ().
The sequence groups symbols in threes using the pattern: pair (ab), reversed pair (ba), then the second symbol doubled (bb). Applying this to the last group starting with ')(': the reverse is '()' and the doubled form is '((' — so the series continues '() , ((', matching option 4 rather than the currently marked option, which has the two terms in the wrong order.