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    print("Cau 4: ")
    sum1_a = sum(x + y for x in range(11) for y in range(11))
    sum2_a = sum((x + 2*y)**2 for x in range(11) for y in range(11))
    print("(a) Sum1:", sum1_a**2, "Sum2:", sum2_a, "=>", sum1_a**2 >= sum2_a)

    sum_b = sum(math.factorial(x) for x in range(11))
    print("(b) 20! =", math.factorial(20), "< sum_0_to_10_x! =", sum_b, "=>", math.factorial(20) < sum_b)

    sum_c = sum(3*x**2 for x in range(11))
    print("(c) Sum:", sum_c, ">= 1000 ?", sum_c >= 1000)

    sum_d = sum(4*x**3 + 6*x**2 + 2*x for x in range(11))
    rhs_d = 10**4 + 2*10**3 + 10**2 - 5**4 - 2*5**3 - 5**2
    print("(d) Sum:", sum_d, ">= RHS ?", sum_d >= rhs_d)