S. 148 : Reassessment-Notice–Death of assessee-Department was not informed of death of assessee even though notice was received by family members-Assessment order not invalid on ground of notice had been served on deceased-No return filed–Failure to issue notice under Section 143(2) does not render reassessment proceedings invalid-Substantial cash deposited in Bank Account of assessee-Sufficient for formation of belief-Addition is confirmed. [S. 68, 143(2), 147]