Questions 731–740 of 975. Imported answers require independent review unless marked reviewed.

Topic practice 975 questionsPage 74 of 98

Question 6

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Which one of the following is NOT a valid identity?
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Question 7

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If

is a regular language over

, which one of the following languages is NOT regular?
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Question 8

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Consider

, where X, Y and Z are all in sign-magnitude form. X and Y are each represented in

bits. To avoid overflow, the representation of Z would require a minimum of:
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Question 9

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Let

be a square matrix. Consider the following two statements on

. I.

is invertible. II. Determinant of

is non-zero.
Which one of the following is TRUE?
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Question 10

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Let

be an arbitrary group. Consider the following relations on

:

:

if and only if

such that


:

if and only if

Which of the above is/are equivalence relation/relations?
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Question 11

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Consider the following two statements about database transaction schedules:
I. Strict two-phase locking protocol generates conflict serializable schedules that are also recoverable.
II. Timestamp-ordering concurrency control protocol with Thomas’ Write Rule can generate view serializable schedules that are not conflict serializable.
Which of the above statements is/are TRUE?
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Question 12

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Let

be an undirected complete graph on

vertices, where

. Then the number of different Hamiltonian cycles in

is equal to
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Question 13

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Compute

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Question 14

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Which one of the following statements is NOT correct about the B+ tree data structure used for creating an index of a relational database table?
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Question 15

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For

, let us consider the regular language

. Which one of the following can be a pumping length (the constant guaranteed by the pumping lemma) for

?
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