Kindly mention the FAN IN of the logical gates to be used.

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$Exclusive-OR$ gate has a propagation delay of $10$ ns and that the $AND$ or $OR$ gates have a propagation delay of $5$ ns.What is the total propagation delay time in the four-bit adder.Assume $FAN-IN =2$

$1)$ ripple adder

$2)$ carry look ahead adder

$1)$ ripple adder

$2)$ carry look ahead adder