for first two bit we can use half adder as there will be no carry..

Debjyoti Bhattacharjee answered

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Debjyoti Bhattacharjee (anonymous)

n-1

Debjyoti Bhattacharjee answered

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Subham Bhowmick (anonymous)

if n-1 is the answer, then you can add 1 bit with no adder at all. I think its n

Subham Bhowmick answered

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Raj (anonymous)

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.