Write a function to determine if a number is divisible by 15. If a number is divisible by 3 and divisible by 5, then it is divisible by 15.
Previous problem: divisible by 14. Next problem divisible by 16.
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Shortest solution (so far) that keeps to the spirit of the challenge. Code is also easy to read.
Another short solution that keeps to the spirit of the challenge.
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