0 votes 0 votes What is the concatenation of $X$ and $Y?$ [shown on-line by the Gradiance system from a stock of choices] is$:$ Theory of Computation ullman theory-of-computation descriptive + – admin asked Apr 2, 2019 • edited Apr 3, 2019 by Lakshman Bhaiya admin 110 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.