1 votes 1 votes The number of configurations of a zig-zag join tree that can be formed when the order of leaves matters. 1. 2n−1 2. (2n−2)!2n−1(n−1)! 3. 2n−2 4. (2n−2)!n!(n−1)! Databases databases nptel-quiz + – gulsanchouhan asked Aug 26, 2017 gulsanchouhan 426 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.