The argumentative strategy of the Rule of 3 refers to

using at least 3 different types of evidence

thinking of 3 reasons to support your opinion

making sure to persuade at least 3 people

How is president obama using an appeal to reason, or logos, in this excerpt? by explaining why each person must work hard in order to succeed by explaining why working together is necessary for success by explaining why attempts at working together in the past failed by explaining why each person must look out for him or her self