Question 1174425
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Thank you for detailed description of these molecular biology basics.



Mathematicians never think in these terms.


So,  I will edit the problem in a way,  as mathematicians do it.



So,  we have the words of the length of  9,  written in the  4-letter alphabet  A,  C,  T,  G,    where repetition is allowed.

The question is &nbsp;&nbsp;<U>how many such &nbsp;9-letter words are possible ?</U>


The answer is  &nbsp;&nbsp;{{{4^9}}},  &nbsp;&nbsp;since in each of &nbsp;9 &nbsp;positions we have &nbsp;&nbsp;4 &nbsp;&nbsp;independent possibilities.


Solved.


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It is interesting to me to know from you, &nbsp;if I correctly translated your problem to &nbsp;Math  --- &nbsp;PLEASE &nbsp;respond.