My Math Forum computation problem

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 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
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Re: computation problem

Quote:
 Originally Posted by CRGreathouse 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?
u can add only two numbers and u can use the number as much as u can so yes u can write 1+1=2
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 2k-1 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
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Re: computation problem

Quote:
 Originally Posted by islam thanx man however i would have requested the exact number not abound
In that case I'll need the numbers.

 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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