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a number is divisible by 12 if the number is also divisible by both 3 and 7. You mean a number is divisible by 21 if it is divisible by 3 and 7.
3, for example.
It is divisible, but it will contain decimals. If you meant a whole number (example: 2,5,18,353, etc) Then no, it is not divisible.
A number is divisible by 3 when the sum of its digits is equal to a multiple of 3. For example, 192/3 = 64, 1 + 9 + 2 = 12/3 = 4. Therefore, 192 is divisible by 3.
Because it is divisible, by 3 for example.