Which of the following logic expressions is incorrect

Explanation

With the EX-OR operation, an odd number of 1's returns 1 and an even number of 1's returns 0. XOR gives 1 only when the inputs are different (A ⊕ B = A'B + AB'). Here 1 ⊕ 1 ⊕ 0 has two 1's, so it equals 0, not 1. Therefore the incorrect expression is (c) 1 ⊕ 1 ⊕ 0 = 1.