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Total number of full and half-adders require to add 32 bit numbers is

  1. 16 half adders , 16 full adders
  2. 1 half-adders , 31 full-adders
  3. 32 half-adders, 0 full-adders
  4. 16 half-adders, 31 full-adders
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someone explain it more?
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ans is B)

because the LSB of two 32 bit numbers can be added using 1 half adder and for the remaining 3 bits( 2 bits of the number that has to be added and 1 bit for the carry produce in privious bits addition) we need a full adder.

Full adder adds 3bits.

Half adder adds 2bits.  

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