Question: For any positive integer n, Euler's totient or phi function, phi (n), is the number of positive integers less than n that are relatively prime

For any positive integer n, Euler's totient or phi function, phi

For any positive integer n, Euler's totient or phi function, phi (n), is the number of positive integers less than n that are relatively prime to n. What is phi (12) ? Which numbers are they? What is phi (55)

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