A 1-bit full adder takes 20 ns to generate carry-out bit...

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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. 10⁷

B. 1.25 × 10⁷

C. 6.25 × 10⁶

D. 10⁵

Answer: Option A

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