S. 148A: Reassessment-Conducting inquiry, providing opportunity before issue of notice-Issuing third notice and furnishing specific details of transaction which was subject matter of earlier notice-Failure to explain or substantiate genuineness of transaction in reply-Notice and order for issuance of reassessment notice is held to be valid by the High Court-SLP dismissed as not pressed. [S. 147, 148, 148A(d), Art. 136]