Bob gives up a chance to marry and have a family in order to go to work in a distant country. Had he married, he would have had two surviving offspring. He sends money back to his sister, who as a result produces five surviving offspring instead of the two she would have had without Bob's assistance. According to Hamilton's rule, Bob's decision was

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The Answer of Bob gives up a chance to marry and have a family in order to go to work in a distant country. Had he married, he would have had two surviving offspring. He sends money back to his sister, who as a result produces five surviving offspring instead of the two she would have had without Bob's assistance. According to Hamilton's rule, Bob's decision was

Bob Gives Up a Chance to Marry and Have a Family