2 votes 2 votes the sequence is shown, the element at the lowest level? thepeeyoosh asked Jan 18, 2018 thepeeyoosh 370 views answer comment Share Follow See all 6 Comments See all 6 6 Comments reply Show 3 previous comments MiNiPanda commented Jan 18, 2018 reply Follow Share Usually level 0 is considered as the root node. And down the tree, level increases..but as hs said, definition of level ,height etc are usually given in the gate question. 1 votes 1 votes thepeeyoosh commented Jan 18, 2018 reply Follow Share https://gateoverflow.in/8409/gate2015-3_13 please consider this question.. 0 votes 0 votes MiNiPanda commented Jan 18, 2018 reply Follow Share okay..there is a confusion regarding the term level. I searched it now. Some are saying root node is in the highest level like this one: https://stackoverflow.com/questions/28434580/difference-between-lowest-level-and-last-level-in-a-binary-tree While wiki is saying root is at level 1 and it increases as we go down. See this picture: https://www.google.co.in/search?q=level+of+a+tree&client=firefox-b-ab&dcr=0&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj_zOTtk-HYAhXJrY8KHaU2BooQ_AUICigB&biw=1366&bih=656#imgrc=7J19xJiE-nrypM: So they should have mentioned it in the question :/ . I guess to solve this Q, no way is there other than taking help from the options. Like 69 and 83 are in the same level. Both can't be true together. So eliminated. 65 is not in the extreme end of the tree i.e. neither a root nor a leaf. so can't be the low'est' one. Left is 67 :P 2 votes 2 votes Please log in or register to add a comment.