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aaaa aaaa Grade: 9
        

What is the sum of


2 raised to 0 ---------------------------------------2 raised to 2008

6 years ago

Answers : (1)

aditya suman
39 Points
										

let s=20+21+--------------------22008


let s1=21+22+---------------22008


s1 is a geometric progression with a=2,r=2 & n=2008


so, s1=a(rn-1)/r-1


s1=2(22008-1)/2-1 = 22009-2 


now, s=20+ s1=1+22009-2=22009-1.

6 years ago
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