P and Q are subsets of the universal set U defined as

Question

U={x:x is an integer and 1<x<15}
P={x:x is odd} and Q={x:x is prime}
Find n(P¹n Q¹)

Answer 1

Not odd, nor prime. 4,6,8,10,12,14 which means even but not prime.
I assume (P¹n Q¹) reads not P and not Q