DescriptionThis is the third clip in a series of seven of building towers four tall problem using red and blue unifix towers. They tell the researcher that they have a total of seventeen towers. However, Brian identifies a tower that he feels is a duplicate and eliminates it. He counts the towers and comes up with a total of sixteen towers. After that he puts aside one tower that he feels is a duplicate and picks another tower from what they had put aside earlier and adds onto the results pile to maintain their solution of seventeen towers. Brian and Jeff are fixated on seventeen as an answer. The researcher passes by their table and tells them to continue working. After, they create an additional tower and increase their total towers to eighteen. They continue back and forth and go until they conclude there are seventeen towers. Using their guess and check strategy which was not effective, they rely heavily on what the other students have as a solution.