Answer
The quark combination $dds$ can not produce $\Sigma^+$
Work Step by Step
The $\Sigma^+$ has charge $+1$
The down quark $d$ has charge $-\frac{1}{3}$
The strange quark $s$ has charge $-\frac{1}{3}$
The net charge of $dds$ is $-1$
Therefore, the quark combination $dds$ can not produce $\Sigma^+$.
