Suppose that $a$ is a multiple of $3$ and $b$ is a multiple of $6$. Which of the following statements must be true?

A. $b$ is a multiple of $3$.
B. $a-b$ is a multiple of $3$.
C. $a-b$ is  a multiple of $6$.
D. $a-b$ is  a multiple of $2$.

List the choices in your answer separated by commas.  For example, if you think they are all true, then answer "A,B,C,D".
Question:
Suppose that $a$ is a multiple of $3$ and $b$ is a multiple of $6$. Which of the following statements must be true?

A. $b$ is a multiple of $3$.
B. $a-b$ is a multiple of $3$.
C. $a-b$ is  a multiple of $6$.
D. $a-b$ is  a multiple of $2$.

List the choices in your answer separated by commas.  For example, if you think they are all true, then answer "A,B,C,D".
Answer:
Let's think step by step.

user
\text{A, B}
Suppose that $a$ is a multiple of $3$ and $b$ is a multiple of $6$. Which of the following statements must be true?

A. $b$ is a multiple of $3$.
B. $a-b$ is a multiple of $3$.
C. $a-b$ is  a multiple of $6$.
D. $a-b$ is  a multiple of $2$.

List the choices in your answer separated by commas.  For example, if you think they are all true, then answer "A,B,C,D".
train