1
GATE CSE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A graph is self-complementary if it is isomorphic to its complement. For all self-complementary graphs on $$n$$ vertices, $$n$$ is
A
A multiple of $$4$$
B
Even
C
Odd
D
Congruent to $$0$$ $$mod$$ $$4$$, or, $$1$$ $$mod$$ $$4.$$
2
GATE CSE 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
In a connected graph, bridge is an edge whose removal disconnects a graph. Which one of the following statements is true?
A
A tree has no bridges
B
A bridge cannot be part of a simple cycle
C
Every edge of a clique with size $$ \ge 3$$ is a bridge (A clique is any complete sub-graph of a graph )
D
A graph with bridges cannot have a cycle
3
GATE CSE 2015 Set 1
MCQ (Single Correct Answer)
+2
-0.6
Suppose L = { p, q, r, s, t } is a lattice represented by the following Hasse diagram: GATE CSE 2015 Set 1 Discrete Mathematics - Graph Theory Question 19 English For any $$x, y ∈ L$$, not necessarily distinct, $$x ∨ y$$ and x ∧ y are join and meet of x, y, respectively. Let $$L^3 = \left\{\left(x, y, z\right): x, y, z ∈ L\right\}$$ be the set of all ordered triplets of the elements of L. Let pr be the probability that an element $$\left(x, y,z\right) ∈ L^3$$ chosen equiprobably satisfies $$x ∨ (y ∧ z) = (x ∨ y) ∧ (x ∨ z)$$. Then
A
pr = 0
B
pr = 1
C
$$0 < p_r ≤ \frac{1}{5}$$
D
$$\frac{1}{5} < p_r < 1$$
4
GATE CSE 2015 Set 1
Numerical
+2
-0
Let G be a connected planar graph with 10 vertices. If the number of edges on each face is three, then the number of edges in G is ___________.
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