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BS Computer Science is a type of bachelor degree usually awarded after 3 to 4 years of collegiate study in Computer Science. 

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what is the important of bs computer science
The BS is important not because people drop out mostly at 2 years of study, but it is that it shows that you graduated from it and got a degree, and means that you are already experienced in studying it. People with BS Computer Science, gets job easier than dropouts.... =)