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Digital Arithmetic Operations and Circuits - Technical MCQs

Q1:

34FC + AD31 = ________.

A E22D

B E31D

C E21D

D E42D

ANS:A - E22D

C + 1 = D.
F + 3 ==> 15 + 3 = 18 => invalid so, subtract 16 from 18 (i.e., 18 - 16 = 2 and Carry out =1) and add Carry 1 to next MSB position.
1 + 4 + D ==> 1 + 4 + 13 = 17 => invalid so, subtract 16 from 17 (i.e., 17 - 16 = 1 and Carry out = 1) and add Carry 1 to next MSB position.
1 + 3 + A ==> 1 + 3 + 10 = 14 ==> E.