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Unformatted text preview: CS70 Discrete Mathematics for Computer Science, Spring 2012 Homework 4 Out: 9 Feb. Due: 5pm, 16 Feb. Instructions: Start each problem on a new sheet. Write your name, section number and CS70 on every sheet. If you use more than one sheet for a problem, staple them together (but do not staple different problems together). Put your solutions in the boxes on Soda level 2 by 5pm on Thursday: your solution to Q1 goes in box CS701, your solution to Q2 goes in box CS702, and so on ( five boxes total). You are encouraged to form small groups (two to four people) to work through the homework, but you must write up all your solutions on your own. 1. [Practice with Modular Arithmetic] (a) For each integer x mod 18, say whether or not x has an inverse, and if it does give the inverse. (b) Use Euclids algorithm to compute gcd(4725 , 273) . Show clearly the recursive calls made by the algorithm. (c) Use the extended gcd algorithm from class to compute the inverse of 7 mod 220. Show clearly the recursive calls made by the algorithm and the results returned by each call....
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This note was uploaded on 03/18/2012 for the course CS 70 taught by Professor Papadimitrou during the Spring '08 term at University of California, Berkeley.
 Spring '08
 PAPADIMITROU
 Computer Science

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