The system of linear equations $x + y + z = 6$, $x + 2y + 3z = 10$, and $x + 2y + az = b$ has no solutions when _____

Question

$a = 2$, $b \neq 3$

$a = 3$, $b \neq 10$

$b = 2$, $a = 3$

$b = 3$, $a \neq 3$

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