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How many five-letter sequences are possible that use the letters c, p, c, p, z

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4 votes

Answer:

To find possible number of ways the five letter sequence

Given letters are c, p, c, p, z

Total number of provided letter is 5

p and c is repeated twice

Length of sequence is 5

The possible ways are


=(5!)/(2!*2!)
\begin{gathered} =(5*4*3*2!)/(2!*2!)=(5*4*3)/(2)=5*2*3 \\ =30 \end{gathered}

Answer is:30

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