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Which of the following problems can be solved using the longest subsequence problem?

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Which of the following problems can be solved using the longest subsequence problem?

(a) Longest increasing subsequence

(b) Longest palindromic subsequence

(c) Longest bitonic subsequence

(d) Longest decreasing subsequence

I got this question in examination.

I would like to ask this question from Longest Common Subsequence topic in chapter Dynamic Programming of Data Structures & Algorithms II

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Correct option is (b) Longest palindromic subsequence

The best explanation: To find the longest palindromic subsequence in a given string, reverse the given string and then find the longest common subsequence in the given string and the reversed string.

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