MCQOPTIONS
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				| 1. | 
                                    When converting binary tree into extended binary tree, all the original nodes in binary tree are | 
                            
| A. | internal nodes on extended tree | 
| B. | external nodes on extended tree | 
| C. | vanished on extended tree | 
| D. | None of the above | 
| Answer» B. external nodes on extended tree | |