export {};

const input: string[] = require("fs").readFileSync(0).toString().trim().split('\n');

const bridge = (N: number, M: number): number => {
    let dp: number[][] = Array.from({length: N+1}, () => new Array(M+1).fill(0));

    for(let n=1; n<=N; n++) {
        for(let m=1; m<=M; m++) {
            if (n===1) dp[n][m] = m;
            else if (n===m) dp[n][m] = 1;
            else dp[n][m] = dp[n-1][m-1] + dp[n][m-1];
        }
    }

    return dp[N][M];
}

input.slice(1).forEach((line) => {
    let [n, m]: number[] = line.split(' ').map(Number);
    console.log(bridge(n,m));
});