A 1-bit full adder takes 20 ns to generate carry-out bit and 40 ns for the sum bit. What is the maximum rate of addition per second when four 1-bit full adders are cascaded ?

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Sandhya Thakur

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📊 Digital Electronics and Logic Design

Q. A 1-bit full adder takes 20 ns to generate carry-out bit and 40 ns for the sum bit. What is the maximum rate of addition per second when four 1-bit full adders are cascaded ?

(A) 10^7
(B) 1.25 x 10^7
(C) 6.25 x 10^6
(D) 10^5

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✅ Correct Answer: (A) 10^7

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