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
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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)
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00xxxxxxx or xxxxxx111 or both
(1/2)^2 + (1/2)^3 = 3/8
.
Ed