Trees - General Questions

What is the minimum possible height of a binary tree with 49 nodes (a single node has height 1)?

What is the minimum possible height of a binary tree with 88 nodes (a single node has height 1)?

What is the maximum number of nodes at level 2 of a binary tree (root at level 0)?

What is the maximum number of nodes at level 6 of a binary tree (root at level 0)?

What is the maximum number of nodes in a binary tree of height 4 (a single node has height 1)?