Doubt regarding the number of rak'ahs when sitting for the final tashahhud

Question : Yes, peace be upon you, and upon you be peace. The question is about doubt. Yes, Shaykh, she says that she doubted the number of rak'ahs in the final tashahhud. What is required of her?

Answer : First, I say that if doubts are frequent with a person, and he hardly prays without doubting, then these are of no account and should not be heeded. No action is taken based on them. Second, if the doubt occurs after the taslim, it should not be heeded, nor should he entertain it in his mind; he should turn away from it. These are two points. Third, if the doubt is genuine and occurs before the taslim, such as doubting whether he prayed three or four rak'ahs, he should perform one rak'ah. Then he should perform the prostration for forgetfulness. He does this before the taslim if he acted on his predominant assumption, and after the taslim if he acted on his predominant assumption before the doubt arose, or if he did not have a predominant assumption. Yes.