Determine if a number is divisible by both 3 and 5. Return true if the number is divisible by both 3 and 5, and false otherwise.
Examples:
Input: num = 15
Output: true
Explanation: 15 is divisible by both 3 (15 ÷ 3 = 5) and 5 (15 ÷ 5 = 3), so return true
Input: num = 10
Output: false
Explanation: 10 is divisible by 5 but not by 3, so return false
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