I'm trying to generate a random number with a shortcode

My code is

function unique_random_number ($ atts) {

// Attributes
$ atts = shortcode_atts (
board (
& # 39; min & # 39; => & # 39; 3 & # 39;
& # 39; max & # 39; => & # 39; 10 & # 39;
)
$ atts,
& # 39; Random & # 39;
)

Find mt_rand ($ atts['min'], $ atts['max'])
// [random min="3" max="10"]

}
add_shortcode (& # 39; random & # 39 ;, single_random_number & # 39;);

but when I try to activate the plugin this error, it shows

Analysis error: syntax error, "mt_rand" (T_STRING) unexpected in

I'm also trying to

retrun rand ($ atts['min'], $ atts['max'])