Given two sequences A and B. Let X(A, B) denote the number of times that A appears as subsequence of B i.e. sequence ab appears 4 times as a subsequence of aebabdb. Let A; denotes the first i characters of string A and A[y denote the th character. Which of the following will computes the recurrence relation C(A, Bj )? CIA, B,) = {0: if (i = 0) if (i>0 and j= 0) AA, B); if A[i] # BU] CA, B) + CIA, 1. B,); if A[i] = BU] CA_ 1. B); if A[i] = BU) CA, B,) + CA,1. B,,); if A[i] = BU] aĄ, B, ); it A[i] = BỤ] CĄ, B) + CIA,1 B,,); if A[1] # BU] %3D %3D b. %3D %3D C. d. None of the above

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Given two sequences A and B. Let X(A, B) denote the number of times that A appears as
subsequence of B i.e. sequence ab appears 4 times as a subsequence of aebabdb. Let A; denotes the
first i characters of string A and A[M denote the Ah character. Which of the following will computes the
recurrence relation C(A, Bj )?
CIA, B,) = {0:
if (i = 0)
if ( > 0 and j= 0)
AA, B,); if A[i] # BU]
a. V
QĄ, B) + CIA 1. B,); if A[i] = B&]
+ CA 1. B); if A[i] = BU]
%3D
QA1. B); if A[i] = BUJ
CA, B) + CA, . B,,); if A[i] = B[]
aA, B, ); it A[i] = BU]
aA, B,) + CIA, 1. B); if A[s] # BU]
%3D
b.
%3D
%3D
C.
d. None of the above
Transcribed Image Text:Given two sequences A and B. Let X(A, B) denote the number of times that A appears as subsequence of B i.e. sequence ab appears 4 times as a subsequence of aebabdb. Let A; denotes the first i characters of string A and A[M denote the Ah character. Which of the following will computes the recurrence relation C(A, Bj )? CIA, B,) = {0: if (i = 0) if ( > 0 and j= 0) AA, B,); if A[i] # BU] a. V QĄ, B) + CIA 1. B,); if A[i] = B&] + CA 1. B); if A[i] = BU] %3D QA1. B); if A[i] = BUJ CA, B) + CA, . B,,); if A[i] = B[] aA, B, ); it A[i] = BU] aA, B,) + CIA, 1. B); if A[s] # BU] %3D b. %3D %3D C. d. None of the above
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