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JEE Main levelSingle correct optionDifficulty 2 of 3bm197

Gly and Ala are the only amino acids available, both must appear in the product, and each may be used more than once. The number of different tripeptides (sequences written N-terminal to C-terminal) is

  1. A6
  2. B8
  3. C3
  4. D9

Answer: A

Total sequences from two amino acids in three positions . Remove all-Gly and all-Ala, leaving 8 - 2 = 6.
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