42 lines
842 B
C++
42 lines
842 B
C++
#include <cstdio>
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#include <iostream>
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#include <cstring>
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#include <algorithm>
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#include <cmath>
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using namespace std;
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double solve0(int m,int n)
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{
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double ans=0;
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for(int i=0;i<=n-1;i++)
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ans+=pow(1.0*m,i);
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return ans;
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}
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double solve1(int m,int n)
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{
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double ans=0;
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double tmp=1;
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for(int i=1;i<=n;i++)
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{
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ans+=tmp;
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tmp*=(m+0.0)/(m-i);
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}
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return ans;
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}
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int main()
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{
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int t;
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while(scanf("%d",&t)!=EOF)
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{
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while(t--)
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{
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int n,m,op;
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scanf("%d%d%d",&op,&m,&n);
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if(op==0)
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printf("%.9lf\n",solve0(m,n));
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else
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printf("%.9lf\n",solve1(m,n));
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}
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}
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return 0;
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}
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