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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm100

Using only glycine and alanine, with repetition allowed, the number of different linear tripeptides that contain at least one residue of each of the two amino acids is

A8
B6
C4
D3

Answer: B

Total tripeptides from two kinds with repetition is

2^{3} = 8

. Remove the two containing only one kind (Gly-Gly-Gly and Ala-Ala-Ala):

8 - 2 = 6

.

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