Question

3 bits full adder contains ____________

(a) 3 combinational inputs

(b) 4 combinational inputs

(c) 6 combinational inputs

(d) 8 combinational inputs

I had been asked this question in class test.

Origin of the question is BCD Adder topic in division Arithmetic Circuits of Digital Circuits

Answer 1

Right option is (d) 8 combinational inputs

To explain: 3 bits full adder contains 2^3 = 8 combinational inputs.