The logic circuit of binary adder which is used to add two 4-bits binary numbers, requires ______ half adder (s) and ______ full adder (s).
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Correct answer: (B) 1 , 3
Explanation
A 4-bit parallel (ripple-carry) adder uses one half adder for the least significant bit, which has no carry-in, and three full adders for the other three bits.