Question

Counting Problem

Answer 1

\(\large \color{black}{\begin{align}
& \normalsize \text{how many different 4 digit numbers can be made } \hspace{.33em}\\~\\
& \normalsize \text{from the first 4 natural numbers (1,2,3,4) } \hspace{.33em}\\~\\
& \normalsize \text{If the repetition is allowed.} \hspace{.33em}\\~\\
& a.)\ 128 \hspace{.33em}\\~\\
& b.)\ 512 \hspace{.33em}\\~\\
& c.)\ 256 \hspace{.33em}\\~\\
& d.)\ \normalsize \text{None of these} \hspace{.33em}\\~\\
\end{align}}\)

Answer 2

well 1"d assume each digit can be used more that once so 1111 is a valid number...?

Answer 3

yes i think

Answer 4

id that it the case then its