A' or A prime = {a, c, e, g, k, l, m, n} <----- elements that are not in Set A
B' or B prime = {b, d, f, j, k, l, m, n} <----- elements that are not in Set B
C' or C prime = {a, b, c, d, e, f, g, h, i, j} <----- elements that are not in Set C
∩ or intersection = elements that 2 or more sets have in common
"The intersection of A prime, B prime, and C prime"
Since all primes have no elements in common, the answer should be a null or empty set { }