As supplement to nice @Mico answer (+1). In your particular case, when all columns are of the same type (c), with use table package tabularray you not need to care about number of columns. They will automatically adopted to content of table body.
Beside this, you can color rows (again automatically) by row{even} = {bg=Cyan} and also put first table row into math mode:
\documentclass{article}
\usepackage{xcolor}
\definecolor{Cyan}{rgb}{0.88,1,1}
\usepackage{tabularray}
\begin{document}
\begin{table}[htb]
\centering % <-- new
\begin{tblr}{hline{1,2,Z}={solid},vlines,
cells = {c},
colsep = {4.4pt},
row{1} = {mode=math},
row{even} = {bg=Cyan}
}
p & q & r & \neg p & \neg q & \neg r
& p \vee r & p \vee q & \neg q \vee \neg r
& (p \vee r) \wedge (p \vee q) \wedge (\neg q \vee \neg r) \
T & T & T & F & F & F & T & T & F & F\
T & T & F & F & F & T & T & T & T & T\
T & F & T & F & T & F & T & T & T & T\
T & F & F & F & T & T & T & T & T & T\
F & T & T & T & F & F & T & T & F & F\
F & T & F & T & F & T & F & T & T & F\
F & F & T & T & T & F & T & F & T & F\
F & F & F & T & T & T & F & F & T & F\
\end{tblr}
\bigskip
\begin{tblr}{hline{1,2,Z}={solid},vlines,
cells = {c},
colsep = {4.4pt},
row{1} = {mode=math},
row{even} = {bg=Cyan}
}
(q \wedge r)
& \neg (q \wedge r)
& p \wedge \neg (q \wedge r)\
T & F & F\
F & T & T\
F & T & T\
F & T & T\
T & F & F\
F & T & F\
F & T & F\
F & T & F\
\end{tblr}
\end{table}
\end{document}

The such a way of "zebra" coloring of tables you can achieve at "classic" table too. Before table you only need to insert:
\rowcolors{2}{white}{Cyan}
and than remove all \rowcolor{Cyan} commands in table body.
\captionon your table (unless that's the purpose of 2b, in which case you should read up on how to caption a table). If there's no caption, there's no reason they need to be in separatetableenvironments (or in atableenvironment at all). See https://tex.stackexchange.com/q/39017/107497 – Teepeemm Feb 09 '22 at 02:24\documentclassand the appropriate packages so that those trying to help don't have to recreate it. When I complete your document, I don't get the space that you see, so without a MWE not sure how to help here. – Peter Grill Feb 09 '22 at 03:55