$\large{\begin{array}{ccccc} && & A &A&A\\ +& & & B&B&B\\ \hline &&1&?&?&?\\ \end {array}}$

$A,$ and $B,$ are two positive integers ,such that $1\leq A<B\leq9$

(Each "question mark" individually may be any value; they do not have to be the same or different.)

which of the choices , cannot be equal to $A\times B.$ ?

$21$
$16$
$30$
$10$

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The only two possible $1$ -digit integers satisfy $A\times B=10$ are $A=2,B=5$ , but in this case , $AAA+BBB=222+555=777.$