How many 4-bit string contain at least one “1”
Question
How many 4-bit string contain at least one “1”
Solution
A 4-bit string can have 2^4 = 16 possible combinations, ranging from 0000 to 1111.
However, the question asks for the number of 4-bit strings that contain at least one "1". The only 4-bit string that does not contain a "1" is 0000.
So, to find the number of 4-bit strings that contain at least one "1", we subtract the one combination that does not contain a "1" from the total number of combinations.
Therefore, the number of 4-bit strings that contain at least one "1" is 16 - 1 = 15.
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