## Thinking Mathematically (6th Edition)

$2^3 \\2^2 \\2^1 \\1$
The expanded form of $1101_{\text{two}}$ is: $1101_{\text{two}} = (1 \times 2^3) + (1 \times 2^2) +(0 \times 2^1) + (1\times 1)$ Thus, the missing expressions in the given statement (in order) are: $2^3 \\2^2 \\2^1 \\1$