The binary B3 B2 B1 B0 is to be converted to Gray code.

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The binary B₃ B₂ B₁ B₀ is to be converted to Gray code. The binary digit that does not require a gate for conversion is—

1. B₁
2. B₃
3. B₃, B₂
4. B₂, B₁

Correct Option: B

Binary to Gray code converter is shown below:

From above figure w e conclude that B₃ does not require any gate. Hence alternative (B) is the correct answer.