2^9 input circuit will have total of ____________ A. 32 entries

2-9-input-circuit-will-have-total-of-a-32-entries

2^9 input circuit will have total of ____________

A. 32 entries

B. 128 entries

C. 256 entries

D. 512 entries

I had been asked this question in a national level competition.

My query is from BCD Adder in portion Arithmetic Circuits of Digital Circuits

Correct answer is D. 512 entries

To explain: 2^9 input circuit would have 512(2*2*2*2*2*2*2*2*2 = 512) entries.