t = int(input())

def solve(n, d):
    if n <= 0:
        return 0
    val = (d - 1) * d // 2
    q = n // (d - 1)
    r = n - (d - 1) * q
    return val * q + r * (r + 1) // 2

for _ in range(t):
    d, a, b = map(int, input().split())
    print(solve(b, d) - solve(a - 1, d))