How many bit strings of length seven either begin with three zeros or end with four ones. 26 22 20 24
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Step 1
There are 4 remaining positions in the string, and each position can be either a 0 or a 1. So there are $2^4 = 16$ possible bit strings that begin with three zeros. Now, let's consider the bit strings that end with four ones. There are 3 remaining positions in Show more…
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