Im confused power of 2 bits vs bit placements.

[dolanduck.]

for example there are 8 bits per segment thing if you add them all up but in the the power of 2 there are only 7 why ?

[ChristianF.]

Remember that 0 is a number as well.

Think matrices/arrays in programming, which starts with index 0 in most languages. Making index 7 the eighth value in the list.

[Giuseppe Larosa]

Hello @dolanduck.  

be aware that 2^0 = 1 actually every number  N^0 = 1 so the rightmost position in an octet/byte is 1 and that 1 allows to represent odd numbers otherwise how you could represent a number like 129 ?

129 = 10000001   in binary   = 2^7 + 2^0 = 128 + 1

Hope to help

Giuseppe