Find (n) for n =3 - Vidyadip

Question

Find $\varphi(n)$ for $n =3$

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Answer

If n = 3,
as, gcd (1,3) = 1 and gcd (2,3) = 1 (gcd = greatest common divisor)
Therefore, numbers coprime to 3 are 1 and 2
Hence $\varphi$(3) = 2

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