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Q. What is the decimal equivalent of binary number 10101

NTA AbhyasNTA Abhyas 2022

Solution:

$\left(10101\right)_{2}=\left(. . . . . .\right)_{10}$
= $1\times 2^{4}+0\times 2^{3}+1\times 2^{2}+0\times 2^{1}+1\times 2^{o}$
$= \, 16 \, + \, 0 \, + \, 4 \, + \, 0 \, + \, 1 \, = \, 21.$