Mathematics · Number Theory
If φ denotes Euler's totient function and p and q are distinct prime numbers, which of the following relations is correct?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1φ(p) = p
- 2φ(p2) = p2 - 1
- 3φ(p2) = (p - 1)2
- 4φ(pq) = (p - 1)(q - 1)✓
Correct answer
φ(pq) = (p - 1)(q - 1)
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