C960 Discrete Mathematics II
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Free C960 Discrete Mathematics II Questions
How many handshakes occur when 12 people each shake hands with every other person exactly once?
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66
-
72
-
132
-
144
Explanation
When each person shakes hands with every other person exactly once, the total number of handshakes can be calculated using the combination formula , which counts the number of ways to choose 2 people out of nnn to shake hands. For 12 people, this is:
Solve the recurrence aₙ = 4aₙ₋₁ − 4aₙ₋₂ with a₀=1, a₁=4
Explanation

Find if (discrete logarithm problem).
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3
-
5
-
7
-
11
Explanation

How many Hamiltonian cycles are there in the complete graph K₅?
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12
-
24
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60
-
120
Explanation
A Hamiltonian cycle in a graph visits each vertex exactly once and returns to the starting vertex. In a complete graph , every vertex is connected to every other vertex.
What is the probability that a random 5-letter string over the alphabet contains at least two consecutive A’s?
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79/243
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8/27
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1/3
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2/5
Explanation

Using Fermat’s Little Theorem, compute mod 7.
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1
-
2
-
3
-
4
Explanation
Fermat’s Little Theorem states that if ppp is a prime number and aaa is an integer not divisible by p, then −1≡1(mod p).
How many edges are in a 5-regular graph with 12 vertices?
-
30
-
60
-
15
-
12
Explanation
In a k-regular graph with nnn vertices, each vertex has degree . The sum of all vertex degrees is:
How many 5-card poker hands contain exactly three of a kind (but not a full house)?
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54,912
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3744
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123,552
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2,598,960
Explanation
Exactly three of a kind means the hand contains three cards of one rank and two other cards of different ranks (and those two must not form a pair, otherwise it would be a full house). Count by choices: pick the rank for the triple , pick which 3 of the 4 suits for that rank , choose 2 distinct ranks from the remaining 12 ranks for the other cards , and for each of those ranks choose 1 of the 4 suits . Multiply: 13×4×66×16=54,912. (For reference, the total number of 5-card hands is 2,598,960, which shows this count is a fraction of all possible hands.)
What is the chromatic polynomial of the complete bipartite graph K_{3,3}?
Explanation

What is the value of the partition function p(8) (number of ways to write 8 as a sum of positive integers, disregarding order)?
-
20
-
21
-
22
-
23
Explanation
The partition function p(n)p(n)p(n) counts the number of ways to write nnn as a sum of positive integers, ignoring the order of the summands. For n=8n = 8n=8, the partitions are:
1.8
2.7 + 1
3.6 + 2
4.6 + 1 + 1
5.5 + 3
6.5 + 2 + 1
7.5 + 1 + 1 + 1
8.4 + 4
9.4 + 3 + 1
10.4 + 2 + 2
11.4 + 2 + 1 + 1
12.4 + 1 + 1 + 1 + 1
13.3 + 3 + 2
14.3 + 3 + 1 + 1
15.3 + 2 + 2 + 1
16.3 + 2 + 1 + 1 + 1
17.3 + 1 + 1 + 1 + 1 + 1
18.2 + 2 + 2 + 2
19.2 + 2 + 2 + 1 + 1
20.2 + 2 + 1 + 1 + 1 + 1
21.2 + 1 + 1 + 1 + 1 + 1 + 1
22.1 + 1 + 1 + 1 + 1 + 1 + 1 + 1
Counting carefully, there are 22 distinct partitions of 8.
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