SOLUTION: How many bit strings of length 9 either begin with 2 bit(s) equal to 0 or end with 3 bit(s) equal to 1?

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Question 520572: How many bit strings of length 9 either begin with 2 bit(s) equal to 0 or end with 3 bit(s) equal to 1?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
00xxxxxxx or xxxxxx111 or both
(1/2)^2 + (1/2)^3 = 3/8
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Ed