Question $4$

Consider the transistor circuit below, in which the $"$A$"$

input is on top and the $"$B$"$ input is on bottom. What

is the output for this series of NAND gates? $($Output

values are listed in a row in the answers instead of a

column as they usually appear in a truth table$).$

$1110$

$0111$

$1000$

$0001$

Got this question wrong can you explain why?