Chapter 4.2A, Problem 8A

To determine

a.

To justify:

Whether if $2|n$ and $3|n$, then $6|n$.

To determine

b.

To justify:

Whether if $4|n$ and $25|n$, then $100|n$.

To determine

c.

To justify:

Whether if $a|n$ and $b|n$, then $ab|n^2$.