Mathematics · Number Theory
Which of the following is true for the Euler totient function (φ)?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1φ(28) = 12✓
- 2φ(28) = 24
- 3If α and β are prime numbers, then φ(αβ) = φ(α) + φ(β).
- 4If α is a prime number, then φ(α) = α + 1.
Correct answer
φ(28) = 12
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