Question

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

Answer 1

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