How Many Different Polypeptides Can Be Made from 5 Amino Acids?

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nemzy
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how many diff polypeptides, each composed of 5 amino acids, could be synthesized using the 20 common amino acids?


the answer is simply 20^5 right?

if not, then can u please tell me what I am doing wrong thx
 
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theoretically yes 20^5, but some of them may be difficult to synthesize