if n-1 is the answer, then you can add 1 bit with no adder at all. I think its n
Subham Bhowmick answered
Debjyoti Bhattacharjee (anonymous)
for first two bit we can use half adder as there will be no carry..
Debjyoti Bhattacharjee answered
As the bits are used in parallel which means atleast 2 types of adders are used and in worst case on both bit streams, 2 half adders can b used as there is no carry bit . There4 the option shud b minimun n-2 full addees.