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A couple with a newborn baby is trouble...

A couple with a newborn baby is troubled that the child does not resemble either of them. Suspecting that a mixup occurred at the hospital, they check the blood type of the infant. It is type O. Because the father is type A and the mother type B, they conclude that a mixup has definitely occurred. Are they correct ? Give reason for your answer.

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The correct Answer is:
No, the parents are not correct. The baby born to father having blood groups A and mother having blood group B can have any one of the four possible blood groups : A, B, AB and O.
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