expression written by the characters(and) are correct bracket expressions,

expression written by the characters(and) are correct bracket expressions, if every opening bracket has its closing pair (as usual mathematics).how many correct bracket expressions can be formed by three pairs of brackets?
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1 Answer

LLLLLL

RLLLLL

RRLLLL

RRRLLL

0 or 1 or 2 or 3

0+1+2+3=5
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