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what is 4999 + all numbers under 4999

 Jan 21, 2016
 #1
avatar+2499 
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infinity

 Jan 21, 2016
 #2
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The sum of all numbers from 1 to 4,999 inclusive is =12,497,500

 Jan 21, 2016
 #3
avatar+8581 
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How do you know this? :/

 Jan 21, 2016
 #4
avatar+2499 
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Sn=n((a1+an)/2

 

4999*(1+4999)/2 = 12,497,500

 

excuse me my mistake

 Jan 21, 2016

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