(1) My one (two or three) rakahs left behind imam, I have done both salams with imam, then I remember, my one (two or three) rakahs is left, so I stand up and complete salah with sajdah sahv. So my salah is valid or not?
Answer:
(Fatwa: 477/477/M=1433)
In the question mentioned above your salah was valid.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband