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We don't know exactly how old Adam, Eve, Cain and Able were at the time of Abel's murder. Gen. 5:3 tells us that Adam was 130 years old when his son Seth was born. Gen. 4:25 suggests that Seth was born shortly after Abel's death. The fact that the Bible focuses on Cain and Abel does not preclude the possibility that Adam and Eve had other children. In fact, taking the position of "what is reasonable?," over a period of 129 years, given the reproductive and sexual tendencies of human beings, is it probable that they were very active reproductively, and that we have enough time for those children to mature, have children of their own, etc.
As an example, we could take some very conservative assumptions that Eve had a child every three years and that half of those children were male, half were female, then assume that those females began having children of their own at about 20 years of age at the same rate, one every three years, half male, half female, and we began to realize that it is reasonable to believe that there were thousands of people on the earth around this time. The point is not to produce an exact number, the point is that it is reasonable to believe that there were a lot of people at that time and they probably did begin to live in groups ("cities") and that Cain would want to find one of them to be his wife.
We don't know what the human population of the earth was at that time, but it is not only reasonable, but also probable that there were enough people on the earth that they began living in groups (cities - certainly very small "cities" by today's standards) and that Cain could find a woman to marry.
It is interesting here that Cain is concerned that those other people may want to kill him. (Gen. 4:15) This is consistent with the concept that the people of that day would recognize that they are all closely related. If, in fact, those other people were strangers, even another race unrelated to Adam, they probably would not care what Cain did to someone who was not one of their own. However, if it is "in the family" it is very understandable that Cain would fear retribution from people who cared what happened to one of their own.
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