For universal set U, and sets A, B which are subsets of U, the following information is given.
n(U) = 36
n(A) = 12
n(B) = 10, n(A ∩ B) = 9
Then, the number of elements that are neither in A nor B is__
n(AI ∩ BI) = n(A U B)I = n(U) - n(A U B)
= n(U) - [n(A) + n(B) - n(A∩B)]
= 36 - [12 + 10 - 9]
= 47 - 13
= 34