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ALLAMA IQBAL OPEN UNIVERSITY, ISLAMABAD (Department of Computer Science) WARNING 1. PLAGIARISM OR HIRING OF GHOST WRITER(S) FOR SOLVING THE ASSIGNMENT(S) WILL DEBAR THE STUDENT FROM AWARD OF DEGREE/CERTIFICATE, IF FOUND AT ANY STAGE. 2. SUBMITTING ASSIGNMENTS BORROWED OR STOLEN FROM OTHER(S) AS ONE’S OWN WILL BE PENALIZED AS DEFINED IN “AIOU PLAGIARISM POLICY”. ASSIGNMENT No. 1 Course: Discrete Mathematics (3406) Semester: Autumn, 2011 Level: BS(CS) Total Marks: 100 Pass Marks: 40 Note: All questions carry equal marks. Q.1 a) Use symbols to write the logical form of the following arguments then use a truth table to test the arguments for validity: If Tom is not on team A, then Hua is on team B. If Hua is not on team b, then Tom is on Team A. Tom is not on team B or Hua is not on team B. (10) b) for the table given below: P Q R S 1 1 1 0 1 1 0 0 1 0 1 1 1 0 0 1 0 1 1 0 0 1 0 1 0 0 1 0 0 0 0 0 i) A A Boolean expression having the given table as its truth table. ii) A circuit having the given table as its input/output table. (10) Q.2 a) Consider the statement “everybody is older than somebody”. Rewrite this statement in the form “ people x, ____ ”. (5) b) Rewrite the statement “Evert action has an equal and opposite reaction.” Formally using quantifiers and variables and write a negation for the statement. (5) c) Use modus and tollens to fill in valid conclusion for the following argument: All health people eat an apple a day. Harry does not eat an apple a day. (5) 1 d) Indicate whether the following arguments are valid or invalid. Support your answer by drawing diagram. All people are mice. All mice are mortal. All people are mortal. (5) Q.3 a) Prove that “The wquare of any integer has the form 4k or 4k + 1 from some integer k”. (5) b) Prove the following statement “there are real number a and b such that ab a b (5) c) Determine whether the statement “the product of any two even integers is a multiple of 4”. Is true or false? If it is true then prove it else give a counter example. (10) Q.4 a) Prove that for all positive integers a and b, a|b if, and only if, gcd(a,b) = a. (5) b) Write an algorithm that accepts the numerator and denominator of a fraction as input and produces as output the numerator and denominator of that fraction written in lowest terms. (5) c) Use the well-ordering principal to prove that if a and b are any integers not both zero, then there exist integers u and v such that gcd(u, v) = ua + vb. (10) Q.5 a) Write the algorithm to determine whether a given element x belongs a given set, which is represented as an array a[1], a[2], a[3] ,…… a[n]. (10) b) Write negation for the following statements; (10) (i) Sets S, a set T such that S T . Which is the true statement or its negation? Explain. (ii) a Set S such that S T . Which is the true statement or its negation? Explain. ASSIGNMENT No. 2 Total Marks: 100 Pass Marks: 40 Note: All questions carry equal marks Q.1 a) Suppose that there are three roads from city A to city B and five roads from city B to city C; (i) How many ways is it possible to travel from city A to city C via city B? (05) (ii) How many different round trip routes are there from city A to B to C to B and back to A in which no road is traversed twice? (05) b) A computer programming team has 14 members; (i) How many ways can a group of 7 are chosen to work on a project? (05) 2 (ii) Suppose 8 team members are women and 6 are men; how many groups of 7 can be chosen that contain 4 women and 3 men. (05) Q.2 a) Draw arrow diagrams for the Booleans function defined by the following input/output table; (10) Input Out put P Q R 1 1 0 1 0 1 0 1 0 0 0 1 b) Given any set of seven integers; (10) (i) Must there be two that have the same remainder when divided by 6? Why? (ii) Must there be two that have the same remainder when divided by 8? Why? Q.3 a) A single pair of rabbits (Male & Female) is born at the beginning of a year. Assume the following conditions’ (10) (i) Rabbit pairs are not fertile during their first two months of life, but there after gave birth to three new male/female pairs at the end of every month; (ii) No deaths occur during the year. 1. Let Sn the number of pairs of rabbits live at the end of month n, for each integer n 1, and ldet S0=1. Find a recurrence relation for S0, S1, S2,… 2. Compute S0, S1, S2 and S4. 3. How many rabbits will be there at the end of the year? b) A number targets herself to improve her time on a certain course by 3 seconds a day. If on day 0 she runs the course in 3 minutes, how fast must she run it on the 14th day to stay on target? (10) Q.4 a) Show that for any real number x, if x>1 then |2x2 + 15x + 4| 21|x2| and use O-notation to express the result? (10) b) Refer to the following algorithm segment. For each positive integer n, let bn be the number of iterations of the while loop’ (10) While (n > 0) n : = n div 3 end while Trace the action of this algorithm segment on n when the initial value of n is 424. Q.5 a) Draw all non-isomorphic graphs with four vertices and no more than two edges. (10) b) Prove that if a walk in a graph contains a repeated edge, then the walk contains a repeated vertex. (10) 3 3406 Discrete Mathematics Credit Hours: 4 (4+0) Recommended Book: Discrete Mathematics with Applications (2nd Edition) By Susanna S. Epp, Pws Publishing, Company Boston U.S.A Course Outlines: Unit No. l Introduction of Mathematical Reasoning Logical Form & Logical Equivalence, Conditional Statements, Valid and invalid Arguments, Digital Logic Circuits, Number Systems and Circuits for additions, Predicates and Quantified Statements, Arguments with Quantified Statements Unit No. 2 Number Theory and Mathematical Induction Introduction, Rational Numbers, Divisibility, division into Cases and the Quotient Remainder Theorem, algorithms, Sequences, Principles of Mathematical Induction, Correctness of Algorithms Unit No. 3 Set Theory Basic Definitions, Properties of Sets, The Empty Set, Partitions, Power Sets, Boolean Algebra, Russell’s Paradox and Halting Problem Unit No. 4 Counting Techniques Counting and Probability, Possibility Trees and Multiplication Rule, Counting Elements of Disjoint Sets, counting Subsets of a Set Unit No. 5 Functions Functions Defined on General Sets, Finite State Automata, One-to-One, Inverse Functions, the Pigeonhole Principle Unit No. 6 Recursion Recursively defined Sequences, Solving Recurrence Relations by Iteration Unit No. 7 Efficiency of Algorithms Real Valued Functions of Real Variable and Their Graphs, O-Notations, Efficiency of Algorithms-I, Efficiency of Algorithms-II Unit No. 8 Graphs Introduction, paths and Circuits, Matrix representation of Graphs, Isomorphism of Graphs Unit No. 9 Boolean Algebra Basic Definition, Basic Theorems and Properties of Boolean Algebra, Boolean Functions, Canonical and Standard Forms, Logic Operations 4

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