Question

Which expression does not belong? 2^3 8 3^2 2^2*2^1

Answer 1

$\begin{gathered} 2^3=8 \\ 2^2\cdot2^1=4\cdot2=8 \\ All\text{ the expressions are equal to 8, but} \\ 3^2=9\ne8 \\ thus \\ 3^2\text{ does not belong } \end{gathered}$