Question

The binary number $10111$ is equivalent to the decimal number

• A. 19
• B. 31
• C. 23
• D. 22

Answer 1

Answer: (C)

23

Answer 2

Hence, $(10111) B=1 \times 2^{4}+0 \times 2^{3}+1 \times 2^{2}$
$+1 \times 2^{1}+1 \times 2^{0}$
$=16+0+4+2+1=23.$