Correct but there is more too it. If individuals can rememeber who was altruistic in the past too them, they can practice recpricol altruism. When you average out chance over the life of an individual practicing reciprical altruism, survival chances are higher INDIVIDUALLY, not just for the group. Read Robert Triver's paper "The Evolution of Recipricol Altruism".
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Correct but there is more too it. If individuals can rememeber who was altruistic in the past too them, they can practice recpricol altruism. When you average out chance over the life of an individual practicing reciprical altruism, survival chances are higher INDIVIDUALLY, not just for the group. Read Robert Triver's paper "The Evolution of Recipricol Altruism".