November 24th, 2010, 05:19 AM  #1 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  computation problem
suppose we have k diffirent odd numbers how many diffirent even numbers can we make out of them

November 24th, 2010, 05:51 AM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: computation problem
What does 'make' mean in this context? Multiplication? Addition? Decimal concatenation?

November 24th, 2010, 06:06 AM  #3 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: computation problem
IT MAENS BY ADDITION SORRY FOR VAGUENESS

November 24th, 2010, 06:08 AM  #4 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: computation problem
another important thing just adding two numbers not more here is ademonstration suppose we have 3 5 7 9 the even numbers by adding two r : 3+5=8 3+7=10 3+9=12 5+7=12 5+9=14 9+7=16 now 12 has been repeated so the number of diffirent even numbers is 5 
November 24th, 2010, 06:40 AM  #5 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: computation problem
How many numbers can we add? Two? Unlimited? How many times can we use each number? Once? Unlimited? Given {1}, can we make 1 + 1 = 2? 
November 24th, 2010, 07:14 AM  #6  
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: computation problem Quote:
thanks for concern buddy  
November 24th, 2010, 08:37 AM  #7 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: computation problem
Well there are k(k+1)/2 sums so we can't make more than that many even numbers. You can surely make at least 2k1 even numbers. Both of these bounds are achievable.

November 24th, 2010, 09:52 AM  #8 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: computation problem
thanx man however i would have requested the exact number not abound

November 24th, 2010, 10:22 AM  #9  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: computation problem Quote:
 
November 24th, 2010, 10:26 AM  #10 
Senior Member Joined: Nov 2010 Posts: 288 Thanks: 1  Re: computation problem
i would request ageneral formula for any k u see with such formula (assuming that goldbachs conjecture is true) we will get avery good approximation for the distribution of prime numbers 

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