Numbers divisible by nine are infinite. They start with these: 9, 18, 27, 36, 45, 54, 63 . . .
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Every multiple of 9, and every number divisible by any multiple of 9, is divisible by 9.
There are an infinite number of them, and we're a bit busy right now.
Yes; all numbers that are divisible by 9 are divisible by 3.
All numbers divisible by 3 are NOT divisible by 9. As an example, 6, which is divisible by 3, is not divisible by 9. However, all numbers divisible by 9 are also divisible by 3 because 9 is divisible by 3.
All numbers divisible by 9 are divisible by 3; since 9 = 3 x 3 all multiples of 9 are also multiples of 3. However, all numbers divisible by 3 are not divisible by 9, eg 6 = 2 x 3 but 6 is not divisible by 9 (since 6 is not a multiple of 9) - it only takes one counter example to disprove a theory.
no, 18 is divisible by 9 but not by 4.
No. It is the other way round.