3. Find the number of n-digit quaternary sequences that contain an odd number of 0's, an even number of 1's and at least one 3.
Added by Jennifer N.
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A quaternary sequence is a sequence that uses only four digits: 0, 1, 2, and 3. So, for each digit in an n-digit sequence, there are 4 choices. Therefore, there are $4^n$ total n-digit quaternary sequences. Show more…
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