To make an n-bit parallel adder how many full adders are required

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To make an n-bit parallel adder how many (minimum) full adders are required ?
a. 1
b. n
c. n-1
d. n+1

Anonymous answered
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    Debjyoti Bhattacharjee (anonymous)

    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.

          Raj answered
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