1
GATE CSE 2007
MCQ (Single Correct Answer)
+2
-0.6
Consider the following Hasse diagrams.
GATE CSE 2007 Discrete Mathematics - Set Theory & Algebra Question 34 English 1
GATE CSE 2007 Discrete Mathematics - Set Theory & Algebra Question 34 English 2
GATE CSE 2007 Discrete Mathematics - Set Theory & Algebra Question 34 English 3
GATE CSE 2007 Discrete Mathematics - Set Theory & Algebra Question 34 English 4

Which all of the above represent a lattice?

A
(i) and (iv) only
B
(ii) and (iii) only
C
(iii) only
D
(i), (ii) and (iv) only
2
GATE CSE 2007
MCQ (Single Correct Answer)
+2
-0.6
A partial order P is defined on the set of natural numbers as following. Herw x/y denotes integer division.
i) (0, 0) $$ \in \,P$$.
ii) (a, b) $$ \in \,P$$ if and only a %
$$10\, \le $$ b % 10 and
)a/10, b/10) $$ \in \,P$$.

Consider the following ordered pairs:
$$\matrix{ {i)\,\,\,(101,\,22)} & {ii)\,\,\,(22,\,\,101)} \cr {iii)\,\,\,(145,\,\,265)} & {iv)\,\,\,(0,\,153)} \cr } $$
Which of these ordered pairs of natural numbers are comtained in P?

A
(i), (iii) and (iv)
B
(ii) and (iv)
C
(i) and (iv)
D
(iii) and (iv)
3
GATE CSE 2007
MCQ (Single Correct Answer)
+2
-0.6
Consider the set of (column) vectors defined by $$X = \,\{ \,x\, \in \,{R^3}\,\left| {{x_1}\, + \,{x_2}\, + \,{x_3} = 0} \right.$$, where $${x^T} = \,{[{x_1}\, + \,{x_2}\, + \,{x_3}]^T}\} .$$ Which of the following is TRUE?
A
$$\left\{ {{{\left[ {1,\, - 1,\,0} \right]}^T},\,{{\left[ {1,\,\,0 ,- 1,\,} \right]}^T}} \right\}$$ is a basis for the subspace X.
B
$$\left\{ {{{\left[ {1,\, - 1,\,0} \right]}^T},\,{{\left[ {1,\,\,0,\, - 1,\,} \right]}^T}} \right\}$$ is a linearly independent set, but it does not span X and therefore is not a basis of X.
C
X is not a subspace of $${R^3}$$.
D
None of the above.
4
GATE CSE 2007
MCQ (Single Correct Answer)
+1
-0.3
Let $$G$$ be the non-planar graph with minimum possible number of edges. Then $$G$$ has
A
9 edges and 5 vertices
B
9 edges and 6 vertices
C
10 edges and 5 vertices
D
10 edges and 6 vertices
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