the sequence is shown, the element at the lowest level?
please consider this question..
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