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#include <stdio.h>
#include <string.h>
int
main(
int
argc,
char
*argv[])
{
int
T,i,j,lineSum;
int
N,M;
int
x[505],y[505];
int
lineL [505][505] ;
scanf
(
"%d"
,&T);
for
(i = 0 ; i < T ;i++){
lineSum = 0;
scanf
(
"%d %d"
,&N,&M);
memset
(lineL,0,
sizeof
(lineL));
memset
(lineL,0,
sizeof
(x));
memset
(lineL,0,
sizeof
(y));
for
(j = 0 ; j < M ;j++){
scanf
(
"%d"
,&x[j]);
}
for
(j = 0 ; j < M ;j++){
scanf
(
"%d"
,&y[j]);
}
for
(j = 0 ; j < M ;j++){
if
(lineL[x[j]][y[j]] == 0 && lineL[y[j]][x[j]] == 0){
lineSum ++;
lineL[x[j]][y[j]]=lineL[y[j]][x[j]]=1;
}
}
printf
(
"%.3f\n"
,lineSum/(N*1.0));
}
return
0;
}
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