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    bit strings

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    (a) How many bit strings of length 6 are there? Explain.

    (b) How many bit strings of length 6 are there which begin with a 0 and end with a 0? Explain.

    (c) How many bit strings of length 6 start with a 0 bit or end with a 0 bit? Explain.

    (d) How many bit strings of length 6 are there which contain exactly 3 ones? Explain.

    (e) How many bit strings of length 6 are there which contain at most 3 ones? Explain.

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    https://brainmass.com/math/discrete-structures/bit-strings-315047

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