input: Write a class Calculator that implements two methods to add two numbers. The first method, add_two_numbers, should take two numbers as input and return their sum. The second method, add, should take three numbers as input and return their sum. If the output of the first method is equal to 3, it should be True. If the output of the second method is equal to 6, it should be True. If the number of input numbers is less than two or greater than three, it should return False.
  
  class Calculator:
   def __init__(self):
     pass
      
   def add_two_numbers(self, a, b):
     return a + b
  
   def add(self, a, b, c):
     return a + b + c
  
  calculator = Calculator()
  assert calculator.add_two_numbers(1, 2) == 3
  assert calculator.add(1, 2, 3) == 6
output: 
  class Calculator:
   def __init__(self):
     pass
      
   def add_two_numbers(self, a, b):
     result = a + b
     return result == 3 if result else result
  
   def add(self, a, b, c):
     if not (2 <= len([a, b, c]) <= 3):
       return False
     result = a + b + c
     return result == 6 if result else result
  