Multiple of Repdigit Base minus 1/Examples/4 times 999 base 10

Example of Multiple of Repdigit Base minus 1

$4 \times 999$ (base $10$) is equal to $3996$.

Proof

From Multiple of Repdigit Base minus 1:

the first digit of $4 \times 999$ is $4 - 1 = 3$

the last digit of $4 \times 999$ is $10 - 4 = 6$

there are $3 - 1 = 2$ instances of $9$ in between.

Hence:

$4 \times 999 = 3996$

$\blacksquare$