Answers

The Brainliest Answer!
2016-07-16T20:26:54+08:00
 S_{n}  a_{1} ( r^{n} - 1)/ r-1

255 = 1 ( 2^{n} - 1)/ 2-1

255 =  2^{n} - 1

256 = 2 2^{n}

 2^{8}  2^{n}

8=n

8 terms must be added
1 5 1
2016-07-16T21:21:07+08:00
There are 4 terms that must be added in the series 1,2,3,4,8,/16,32,64,128/.When you add this all number.the sum is 255
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