2nd or 3rd Rakat۲۔۳ رکعت

In 4 Rakat Namaz, doubt occurs during 2nd Sajdah... Is this my 2nd or 3rd rak'at?

Solution... Consider as 3rd and finish the salaat after 4th rak'at.

Soon after Namaz: Recite 1 rak'at Namaz-e-Ehtiyaat standing.