Q167 / 270 · NDA 2018 (Phase 1) · Mathematics

The binary number expression of the decimal number 31 is

A
$1111$
B
$10111$
C
$11011$
Correct answer
D
$11111$

Solution

Decimal number $=31$. \begin{array}{c|c|c}2 & 31 & 1 \\2 & 15 & 1 \\2 & 7 & 1 \\2 & 3 & 1 \\2 & 1 & 1 \\& 0 &\end{array} So, binary form of 31 is 11111.

Hence, the correct answer is option: 'D'.

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