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Solution


Q.

The number of tripeptides formed by three different amino acids using each amino acid once is ______.                  [2024]

Ans.

(6)

There are six possible ways to arrange three distinct objects a, b and c:

1.  abc       2. acb       3. bca       4. bac       5. cab       6. cba

Hence, there are six tripeptides possible using three different amino acids, each used once. It should be noted that abc and cba are different tripeptides as illustrated below: