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NIELIT 2021 Dec Scientist A - Section B: 94

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B. 1 half-adders, 15 full-adders


For LSB addition we do not need a full adder.

For addition of subsequent bits we need full adders since carry from previous addition has to be fed into the addition operation.

N Full adder= N-1 Full adder  + 1 half adder

                      N-1 (2 half adder + 1 OR gate ) + 1 half adder

                     2N-2+1 (half adder ) + N-1(OR gate )

                     2N-1 half adder + N-1 OR gate

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