Consider two strings A = "qpqrr" and B = "pqprqrp". Let x be the length of the longest common subsequence (not necessarily contiguous) between A and B and let y be the number of such longest common subsequences between A and B. Then x +y = ___.

Consider two strings A = "qpqrr" and B = "pqprqrp". Let x be the lengt

1.	Consider two strings A = "qpqrr" and B = "pqprqrp". Let x be the length of the longest common subsequence (not necessarily contiguous) between A and B and let y be the number of such longest common subsequences between A and B. Then x +y = ___.
A.	7
B.	9
C.	11
D.	13
Answer» B. 9