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November 24th, 2010, 04:19 AM   #1
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computation problem

suppose we have k diffirent odd numbers how many diffirent even numbers can we make out of them
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November 24th, 2010, 04:51 AM   #2
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Re: computation problem

What does 'make' mean in this context? Multiplication? Addition? Decimal concatenation?
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November 24th, 2010, 05:06 AM   #3
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Re: computation problem

IT MAENS BY ADDITION SORRY FOR VAGUENESS
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November 24th, 2010, 05:08 AM   #4
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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
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November 24th, 2010, 05:40 AM   #5
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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?
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November 24th, 2010, 06:14 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
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November 24th, 2010, 07:37 AM   #7
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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.
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November 24th, 2010, 08:52 AM   #8
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Re: computation problem

thanx man however i would have requested the exact number not abound
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November 24th, 2010, 09:22 AM   #9
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Re: computation problem

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Originally Posted by islam
thanx man however i would have requested the exact number not abound
In that case I'll need the numbers.
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November 24th, 2010, 09:26 AM   #10
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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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