Check Power of Three
MATH

Problem

Given a positive integer num, return true if num is a power of three, and false otherwise.

Examples

isPowerOfThree(81) // returns true // 81 is a power of three (3^4) isPowerOfThree(9) // returns true // 9 is a power of three (3^2) isPowerOfThree(2) // returns false // 2 is not a power of three
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