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A number that is divisible by 15 is divisible both by 5 and 3 A number is divisible by 5 if it ends with 0 or 5 A number is divisible by 3 if the sum of its digits is divisible by 3 e.g. 4035 is divisible by 15 as it ends with a 5 and 4+0+3+5=12 which is divisible by 3
Absolutely - any number that is divisible by 12 - is also divisible by 6 !
Every number divisible by 10 is divisible by 5.
13 is one such number.
No, it is not.