#include <fstream>
using namespace std;
ifstream cin("piggy.in");
ofstream cout("piggy.out");
int zhu,fang,f[1000001],ans=0;
void dfs(int step)
{
	int r,a;
	if (step>zhu)
	{
		a=0;
		for (r=1;r<=fang;r++)
			if (f[r]==0) a=1;	
		if (a==0) ans++;
	}else
	{
		for (r=1;r<=fang;r++)
		{
			f[r]++;
			dfs(step+1);
			f[r]--;
			if (f[1]==0) {cout<<ans/(fang-1)<<endl;ans=-1;return;}
		}
	}
}
int main()
{
	int t,i,j;
	cin>>t;
	for (i=1;i<=t;i++)
	{
		cin>>zhu>>fang;
		if (zhu<fang) cout<<0<<endl;else
		{
			for (j=0;j<=zhu;j++) f[j]=0;
			ans=0;dfs(1);
			if (ans!=-1) cout<<ans/(fang-1)<<endl;
		}
	}
	return 0;
}