Question

how many different protein sequences of 60 residue can be formed from 20 amino acids​

Answer 1

Answer:

160,000 different

Since each of the 20 amino acids is chemically distinct and each can, in principle, occur at any position in a protein chain, there are 20 × 20 × 20 × 20 = 160,000 different possible polypeptide chains four amino acids long, or 20n different possible polypeptide chains n amino acids long.