A password for a computer system must have at least 8, but no more than 12, characters, where character in the password is a lowercase English letter, an uppercase English letter, a digit, or o six special characters *, >, <, !, +, and =. Determine how long it takes a hacker to try every pos: password, ssuming that it takes one nanosecond for a hacker to check each possible password.

Q: Consider the set A = {2, 3, 5, 11, 12, 13} and the relation Va, b E A, a R b → a = b mod 3. List all…

A: Given the set, A=2, 3, 5, 11, 12, 13 and the relation ∀a,b∈A, a R b↔a≡b mod 3

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A: Since you have posted a multi subparts question according to guildlines I will solve first three…

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Q: How many permutations of the letters OPQRSTU contain the strings QPO and PRS?

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Q: a) Write the proposition for the following English sentence: 1) A) If Benjamin have cough, fever,…

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A: Strong Induction: In strong induction, we assume that the statement is true for all  we prove the…

Q: Exercises: Find the solution of each reenrrence relation. an+2 = 4an+1- 4a, with initial terms a,=5…

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Q: Select the argument that is valid. O if 7 is odd then 9 is even 7 is odd or 9 is not even :: 7 is…

A: An argument is valid if and only if conclusion is true for each and every assumption.

Q: There are 20 different time periods during which classes at a university can be scheduled. If there…

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Q: (a) Show that if a graph has an Euler tour, then the degree of each of its vertices is even. In the…

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Q: Select the solution to each of these recurrence relations: 2(n + 1)! 3n + 1 5. (-1)^n 3· (2^n)n! an…

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Q: (a) Solve for x if 25x = 15(mod 29).

A: Linear congruence

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Q: Assume that the population of the world in 2010 was 6.9 billion and is growing at the rate of 1.1% a…

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Q: If there are 1022 different classes at a university, how many different rooms are required in order…

A: according to question, 1022 different classes are there at a university and we have to schedule all…

Q: b) Let the functions f, g and h be defined as follows: f: R→ R ; f(x) = 4x − 3 g: R → R; g(x) = x² +…

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Q: a) Indicate the order in which the labeled nodes would be traversed with preorder transversal. b)…

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Q: QUESTION 6 Prove that for sets A, B and C, that A n (BUC) =(ANB)U (ANC) using just the basic…

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Q: () The operation of subtraction A, BHA-B of matrices A, Bhaving the same size is defined by as…

A: Given: (i) S and T are relations on a finite set A, MS and MT are matrices of S and T respectively.…

Q: Suppose that fis a function from A to B, where A and B are finite sets with |A|=|B|. Then fis…

A: We can solve this using definition of one to one and onto

Q: Exercises: Find the solution of each recurrence relation. (a) an=7an-1-10an-2 with a,=2 and a,=3.

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: p=T, q = T, and r = F. Select the correct truth values for the two propositions:(qvr)→-p-r>>(p^q)…

A: Sol:- First Tabulate the Truth Table for both the prepositions :- q rr pp \left(q \vee r\right)…

Q: Question 4 Let A = psinø a, +p' a,. Evaluate A dl given that L is the path shown in the figure.…

A: Given that, From the line integral of a closed loop ...

Q: 1. Let A, B and C be atomic propositions. We are given a proposition I = A ^¬B⇒¬(A ^¬C) v (A ^…

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Q: p = F, q = T, and r = T. Select the expression that evaluates to true. O-(qvr) O (-par)vq O (-qvr)^p…

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Q: a) Find a recurrence relation that would determine the number of sequences a1, a2, ., an that have…

A: To determine the recurrence relation that would determine the number of sequences a1, a2,…,an that…

Q: 5. Prove the statement: Let X and Y be two finite sets with |X|=m and |Y|=n. If there is a…

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Q: Select the logical expression that is equivalent to:-3x(Q(x)^(P(X)VS(x))) x(Q(x)vP(x)v(x))…

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Q: Q. No. 1: Prove the following using propositional logic: Show that (p → q) = p ^ ¬9 Show that -(p v…

A: Formula: p→q=¬p∨q Formula: ¬a∨b=¬a∧¬b Formula: ¬¬p=p (i) The given statement is: ¬p→q≡p∧¬q By the…

Q: Consider the set A = {2, 3, 5, 7}. Create a relation R on A that is a partial order with at least…

A: The given set is  A=2,3,5,7 and we have to define a partial order relation R on set A with at least…