1.

Define a function phi:NtoN as follows phi(1)=1,phi(P^(n))=P^(n-1)(P-1) is prime and n epsilonN and phi(mn)=phi(m)phi(n) if m & n are relatively prime natural numbers. phi(8n+4) when n epsilonN is equal to

Answer»

`2phi(4n+2)`
`PHI(2n+1)`
`2PI(2n+1)`
`4PI(2n+1)`

ANSWER :C


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