What is the decimal equivalent of the binary number of 10111?

A 21

B 39

C 42

D 23

Solution

Correct Answer: Option D

(10111)2 = (1 × 24) + (0 × 23) + (1 × 22) + (1 × 21) + (1 × 20)
              = 16 + 0 + 4 + 2 + 1
              = 23

∴ (10111)2 = (23)10

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