[R] how to calculate this natural logarithm

[zhaoxing731]

Hello

	I want to calculate natural logarithm of sum of combinations as follow: (R code)

	{
		com_sum=choose(2000000,482)*choose(1000000,118)+choose(2000000,483)*choose(1000000,117)+...+choose(2000000,i)*choose(1000000,600-i)+...+choose(2000000,600)*choose(1000000,0)                  #calculate the sum
	   result=log(com_sum)                          	   #calculate the log of the sum
	}

	But every element of the com_sum is Inf, so I can't get the result
	Thank you in advance

	Yours sincerely
 
ZhaoXing
Department of Health Statistics
West China School of Public Health
Sichuan University
No.17 Section 3, South Renmin Road
Chengdu, Sichuan 610041
P.R.China
	
	

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