PYTHON Question 4: Sum of the first N natural numbers: Part 1: Write a function sumNaturals (n) that returns the sum of the first n natural numbers. You can use this formula 1 + 2 + ... + n = n(n+1) / 2.  Make sure that the function returns an integer.  Do not use a for loop or a while loop.  def sumNaturals(n):     """ Sum all the first n natural numbers.     >>> sumNaturals(3) # 1 + 2 + 3 = 6     6     >>> sumNaturals(5) # 1 + 2 + 3 + 4 + 5 = 15     15     """     *** YOUR CODE HERE *** Part 2: Define a lambda expression that takes n and returns the sum of the first n natural numbers, using the above formula.

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