EXPLANATION:
Required;
We are required to identify which of the numbers are divisible by 3 and 9 while stating the rules of divisibility.
Step-by-step solution;
For a number to be divisible by 3, then the sum of the digits making up that number must be divisible by 3.
Hence, we have for 3;
[tex]\begin{gathered} 2+7+4=13 \\ \\ 4+7+3=14 \\ \\ 4+7+0=11 \end{gathered}[/tex]
13 is not divisible by 3.
14 is not divisible by 3 and
11 is not divisible by 3.
Also, for a number to be divisible by 9, the sum of its digits should be divisible by 9.
Hence, we have for 9;
[tex]\begin{gathered} 2+7+4=13 \\ \\ 4+7+3=14 \\ \\ 4+7+0=11 \end{gathered}[/tex]
None of these is divisible by 9.
Therefore,
ANSWER:
[tex]\begin{gathered} (a)\text{ }None\text{ }of\text{ }these \\ \\ (b)\text{ }None\text{ }of\text{ }these \end{gathered}[/tex]
