Question 401664
how many bit string of length eight either start with a 1 bit or end with the two bits 00
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Starting with the 1 bit = 128 to 255 = 128 numbers
Ending with 00 = 256/4 = 64 numbers
Half of these 64 numbers start with 1, leaving 32.
Assuming starting with 1 and ending with 00 is counted only once:
128 + 32 = 160 numbers