Final answer:
The fallacy present in the statement about Geraldine's chances in gymnastics is a hasty generalization, which is when a conclusion is drawn without sufficient evidence.
Step-by-step explanation:
The fallacy used in the sentence "Geraldine is 13. She is 4 feet 10 inches tall and is very flexible. She should have a good chance at winning the Olympic gold in gymnastics" is an example of a hasty generalization. A hasty generalization is a logical fallacy where a conclusion is not logically justified by sufficient or unbiased evidence.
In this case, the conclusion that Geraldine should have a good chance at winning Olympic gold is based solely on her age, height, and flexibility, which are not enough to determine her gymnastic prowess or predict success at the Olympic level. True assessment would consider her skills, experience, competition level, and other relevant factors.