You are given:
* a positive integer n,
* an integer k, 1<=k<=n,
* an increasing sequence of k integers 0 < s1 < s2 < ... < sk <=
2n.
What is the number of proper bracket expressions of length 2n with
opening brackets appearing in positions s1, s2,...,sk?
plz.. explain how to solve this problem
thanks in advance
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