Compute ϕ(p2q)\phi(p^2 q)ϕ(p2q) where p,qp, qp,q are distinct primes.
p(p−1)(q−1)p(p-1)(q-1)p(p−1)(q−1)
p2(q−1)p^2(q-1)p2(q−1)
(p−1)2(q−1)(p-1)^2(q-1)(p−1)2(q−1)
p(p−1)qp(p-1)qp(p−1)q