If we write the first 10,000 numbers in six columns, as started below, then 9999 would be in the fifth column. Write enough (numbers, words) to make your thinking clear.
$\begin{array} { l l l l l l }
1 & 2 & 3 & 4 & 5 & 6 \
7 & 8 & 9 & 10 & 11 & 12
\end{array}$

Question

If we write the first 10,000 numbers in six columns, as started below, then 9999 would be in the fifth column. Write enough (numbers, words) to make your thinking clear. 
$\begin{array} { l l l l l l } 
1 & 2 & 3 & 4 & 5 & 6 \
7 & 8 & 9 & 10 & 11 & 12
\end{array}$

Quizplus · Accepted Answer

Given the pattern, every number is sequentially placed in the next column. With 6 columns, the cycle repeats every 6 numbers. Since 9999 % 6 = 3, 9999 would be in the fourth column, not the fifth.

If We Write the First 10,000 Numbers in Six Columns 123456789101112\begin{array} { l l l l l l } 1 & 2 & 3 & 4 & 5 & 6 \\7 & 8 & 9 & 10 & 11 & 12\end{array}17​28​39​410​511​612​

If We Write the First 10,000 Numbers in Six Columns $\begin{array} { l l l l l l } 1 & 2 & 3 & 4 & 5 & 6 \\7 & 8 & 9 & 10 & 11 & 12\end{array}$