Answer / nikki

nmos passes a good 0 and a degraded 1 , whereas pmos passes
a good 1 and bad 0. for pass transistor, both voltage
levels need to be passed and hence both nmos and pkmmos
need to be used.

Answer / @nks

Because we can't get full voltage swing with only NMOS or
PMOS ... we have to use both of them together for that purpose.

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