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July 30, 2016
Posted by **Anonymous** on Monday, May 7, 2012 at 1:53am.

- math problem please help -
**Reiny**, Monday, May 7, 2012 at 8:28amIf a(2) = 1/2 , with r = 1/2

then a(1/2)r = 1/2

and a = 1

now just use the formula

sum(10) = 1( 1 - (1/2)^10)/(1-1/2)

= (1 - 1/1024)/(1/2)

= 2(1023/1024)

= 1023/512