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There are ten, in order from most common to most rare: O+ O- A+ A- B+ B- AB+ AB-. O+ is the most common with AB- being the rarest

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11y ago
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12y ago

They're are 4 different blood types. The blood types are,A,B,O & AB. Each blood type can be Rh positive or Rh negative. Example; A+,A-,B+,B-,O+,O-,AB+ and AB-

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Q: How many types of human blood are there?
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