
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
September 29th, 2013, 06:55 PM  #1 
Member Joined: Sep 2011 Posts: 98 Thanks: 1  LCM & HCF doubts
Hi, I have encountered some problem with the below questions. Thank you in advanced for the help. The numbers a, b and c written as a product of their prime factors, are a= 2^3 * 3 * 7 b= 2^3 * 2^2 * 5 c= 2* 3 * 5^ 2 *7 a). Find the largest integer that will divide a, b and c exactly, b). the smallest positive integer n for which n is a multiple of c, 
September 29th, 2013, 07:06 PM  #2 
Math Team Joined: Nov 2010 From: Greece, Thessaloniki Posts: 1,989 Thanks: 133 Math Focus: pre pre pre pre pre pre pre pre pre pre pre pre calculus  Re: LCM & HCF doubts and 
September 29th, 2013, 07:23 PM  #3 
Member Joined: Sep 2011 Posts: 98 Thanks: 1  Re: LCM & HCF doubts
May i know how to get a) which is 2^3 and b) 2^5*3*5^2*7

September 29th, 2013, 07:33 PM  #4 
Math Team Joined: Nov 2010 From: Greece, Thessaloniki Posts: 1,989 Thanks: 133 Math Focus: pre pre pre pre pre pre pre pre pre pre pre pre calculus  Re: LCM & HCF doubts [color=#000000]Here is the trick that will make you remember it for every pairtriple etc for the first question watch for the common primes with the lowest power and for the second take each prime once put it in order and take its highest power. For example let then and (for lcm look for the common ). [/color] 

Tags 
doubts, hcf, lcm 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
graph doubts  Alexis87  Algebra  0  August 4th, 2013 03:16 AM 
mean calculation doubts  Alexis87  Algebra  1  August 3rd, 2013 08:05 PM 
Probability doubts  Alexis87  Probability and Statistics  4  July 28th, 2013 08:51 AM 
Doubts !  saravananr  Algebra  5  September 7th, 2012 07:18 PM 
3 doubts plz help!!  vasudha  Calculus  4  February 22nd, 2012 07:30 AM 