Question 1092600
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Hey, I answered to similar post before.


But you sent it again, and it is &nbsp;<U>VERY GOOD</U>, &nbsp;because I changed my mind comparing with my earlier posts.


I made my small research in the Internet regarding &nbsp;"octapeptide".


What I learned in relation to our problem is &nbsp;<U>THIS</U>:


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1.  Octapeptide is an line chain of 8 amino acids.


2.  These elementary amino acids may repeat in the chain. Repeating is allowed.


3.  For our problem it does not matter that there are 4 amino acids of one type, 

    2 amino acids of the other type and  2 amino acids of the third type.


4.  I still didn't find if there are restrictions for the order of placing amino acids in the line.

    I suspect that a compehensive answer to this last question is in dark for chemists/biochemists.


{{{highlight(SO)}}}


    I will <U>ASSUME</U> that the problem asks in how many ways 8 different amino acids can be placed in a row if repeating is allowed.


    Then the answer is:  in  {{{8^8}}} = 16777216 ways.


    Any of 8 in the first position.
    Any of 8 in the second position.
    Any of 8 in the third position.
    ........  and  so  on  .......
    Any of 8 in the eighth position.


In all, {{{8^8}}} = 16777216 ways.
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