Can i see the answer with explanations?
Extracted text: 1. Which of the following is incorrectly written set? Why? а. S%3D {1,2, 3, 4} b. S= {a, b, c, d} C. S= {d, c, b, a} d. S= {1,3, 90, a, Hello} S= {1,2, 3, 1, 2, 3} f. S%3D {a, b, с, d, с, b, а} е.