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Suppose R is a one-to-one relationship from R1 = { a, b, c, d} to R2...
Suppose R is a one-to-one relationship from R1 = { a, b, c, d; to R2 = {e, f, g, h} of the following sets, which one is NOT a valid instance of R? (2 points) Select one: f), the empty set. {(cg)} {(a, e) (b,f).(b,9)} {(ah), (b, g),c, f), (d, e)} All of the above None of the above.
Find the decopmosition of R into R1(A, B, C), R2(B, C,D ) and R3(C, D, E) Let R(A,B,C,D,E) be a relation with FDs F = {AB-CDAE, C-D, D-E} The decomposition of R into R1(A, B, C), R2(B, C, D) and RP(C, D, E) is (2 Points) Select one: Lossy and Not Dependency Preserving. Lossless and Not Dependency Preserving. Lossy and Dependency Preserving. Lossless and Dependency Preserving.
int c = 75; int d = 100; int& r1 = c; int& r2 = d; c++; r2++; Use the code above. Suppose the variable c lives at memory address 512, and d lives at the memory address 1024. The size of an integer is 4 bytes. After execution of the above code, draw labelled boxes for each of the 4 variables c, d, r1 and r2, and show their integer values. For r1 and r2, draw an additional arrow...
4 A 8 A V- 12 59. Given Ri > R2, what is the relationship between V1 and V2? d. No conclusion can be made Given R1 > R2, what is the relationship between I, and 12? b 11 12 c. 1, >12 d. No conclusion can be made Which of the following is a valid equation? b. 12 11-4A 121 d 12 12A-1 e 12 11-12A 4 A 8 A V- 12 59. Given Ri > R2, what is...
1. If two resistors,R1 and R2 are connected in parallel. R2>R1. What can you say about the resistance R of this combination? Select one and explain the reason behind choosing the answer: a. R1>R b. R2>R>R1 c. R>R2 d. None of the above 2. If you connect a zero ohm wire across the terminals of a 12-volt battery,how much current would result, according to Ohm’s Law? Select one and explain the reason behind choosing the answer: a. No current at...
Let R(A,B,C,D) be a relation with FDs F = {A—B, AC, C-A, B,C, ABC-D} Which of the following statements is correct ? (2 points) Select one: G = {A-B, B-C, C-A, AC=D } is a canonical cover of F H = { AC, CA, BC,BD} is a canonical cover of F. o F is a canonical cover of itself. O G and H are canonical covers of F. None of the above.
5. (3, 4, 3 points) Let A-a, b, c, d, e, f, g (a) how many closed binary operations f on A satisfy Aa, b)tc b) How many closed binary operations f on A have an identity and a, b)-c? (c) How many fin (b) are commutative? 6. 10 points) Suppose that R and R are equivalent relations on the set S. Determine whether each of the following combinations of R and R2 must be an equivalent relation. (a) R1...
Let R(A,B,C,D) be a relation with FDs F = {A-B, A-C, C-A, B-C, ABC—D} Which of the following statements is correct ? (2 Points) Select one: G= {A-B, B-C, C-A, AC-D } is a canonical cover of F O H = {A-C, C-A,B,C,B-D) is a canonical cover of F. o F is a canonical cover of itself. G and Hare canonical covers of F. None of the above.
Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, DE} The decomposition of R into R1(A, B, C), R2(B, C, D) and R3(C, D, E) is (2 Points) Select one: Lossy and Dependency Preserving. Lossless and Not Dependency Preserving. Lossy and Not Dependency Preserving. Lossless and Dependency Preserving.
Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, D-E} The decomposition of Rinto R1(A, B, C), R2(B, C, D) and R3(C, D, E) is 2 Points) Select one: Lossless and Dependency Preserving. Lossy and Not Dependency Preserving. Lossless and Not Dependency Preserving. Lossy and Dependency Preserving.