MOD = 10**9 + 7

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    T = int(data[0])
    idx = 1
    for _ in range(T):
        C = int(data[idx])
        idx += 1
        P = int(data[idx])
        idx += 1
        
        if C < P:
            print(0)
            continue
        
        twoP_minus1 = 2 * P - 1
        if C < twoP_minus1:
            print(0)
            continue
        
        A = C - 2 * P + 2
        B = C - P + 1
        
        if B >= MOD:
            print(0)
        else:
            product = 1
            for x in range(A, B + 1):
                product = (product * x) % MOD
            print(product % MOD)

if __name__ == "__main__":
    main()