Decimal number 15 is equivalent to the binary number:

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000101

001111

101101

110001

answer is D.

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Detailed Solution

$\begin{array}{l} 2 |\underline{15} \\ 2 |\underline{7 - 1} \\ 2 |\underline{3 - 1} \\ 2 |\underline{1 - 1} \\ 0 - 1 \end{array}$
$∴ 15_{(10)} = 1111_{(2)}$

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