Answer:
,42,63,84,105,126,147,168,189,210,231
Explanation:
just keep multiplying by 2
The multiples of 21 are 21,42,63,84,105,126,147,168,189,210,231,252,273,294,315,336,357,378,399,420,441,462.
But if you meant the factors of 21 they are1, 3, 7 and 21.
