Praise be to Allah.
In the case of doubt as to the number of rak’ahs, one should act on the basis of what is certain, so he should assume the smaller number of rak’ahs. So if he acts according to what is more likely, i.e., what he thinks is most likely to be the case, even by looking at those who are next to him, there is nothing wrong with that, provided that he does sujood al-sahw (prostration of forgetfulness) in either case.
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