Question

which of the following has a terminating decimal expansion

Answer 1

Step-by-step explanation:

by

$\begin{array}{ |l| }\begin{gathered} \hline\hline \hline\boxed{\tt{ \sum_{r = 0}^{n - 1}r \: = \: \frac{n(n - 1)}{2} \: }} \\ \end{gathered} \end{array}$