Is it possible that father is having blood group O+ mother is having AB+ and their child has O+ blood group?

No. The chances of blood group O+ in a child born to parents having blood group AB+ and O+ is Zero. 
Chances of blood group of child born to these parents would be 50% A or 50% B.But it will never be O or AB.
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nope..
 
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AB plus
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No
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Yes. It's possible
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If The father has blood group O and mother has AB, then the possible blood groups in their children will be-
Father- ioio
Mother-IaIb

Hence the possible blood groups of the children will be A or B but not O.
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Yess
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No..it's not possible
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