Match List I with List II. Let R1 = {(1,1),(2,2),(3,3)} and R2 =…
2020
Match List I with List II.
Let R1 = {(1,1),(2,2),(3,3)} and R2 = {(1,1),(1,2),(1,3),(1,4)}.
List I
A. R1 ∪ R2
B. R1 − R2
C. R1 ∩ R2
D. R2 − R1
List II
I. {(1,1),(1,2),(1,3),(1,4),(2,2),(3,3)}
II. {(1,1)}
III. {(1,2),(1,3),(1,4)}
IV. {(2,2),(3,3)}
Choose the correct matching.
- A.
A-I, B-II, C-IV, D-III
- B.
A-I, B-IV, C-III, D-II
- C.
A-I, B-III, C-II, D-IV
- D.
A-I, B-IV, C-II, D-III
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Correct answer: D
Correct answer: A-I, B-IV, C-II, D-III
A. R1 ∪ R2 contains every distinct ordered pair from both relations, so it matches I.
B. R1 − R2 keeps the elements that are in R1 but not in R2. This gives {(2,2),(3,3)}, so it matches IV.
C. R1 ∩ R2 keeps only the ordered pairs common to both relations. The common pair is {(1,1)}, so it matches II.
D. R2 − R1 keeps the elements that are in R2 but not in R1. This gives {(1,2),(1,3),(1,4)}, so it matches III.
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