Right option is (b) 208
Best explanation: PIE is used to count the elements of a set and stated as the sum of elements in A or B is equal to the sum of elements in A plus the sum of elements in B minus the sum of elements in A and B. Let A be the set of multiples of 4 and B be the set of multiples of 5, then A ⋂ B is the set of multiples of 20, and hence
\(\frac{520}{4} + \frac{520}{5} – \frac{520}{20}\) = 208.