Sum of first N Even and Odd numbers Python

PROGRAM TO FIND THE SUM OF FIRST N NATURAL EVEN NUMBERS AND ODD NUMBERS



# function to find sum of first n even numbers
def evensum(n) :
    return n * (n + 1)

# function to find sum of first n odd numbers
def oddsum(n) :
    return (n * n)
  
# Driver Code
n = 20
print ("Sum of first ", n, " Even Numbers is: ", evensum(n))
print ("Sum of first " , n, " Odd Numbers is: ", oddsum(n))


OUTPUT
Sum of first 20 Even Numbers is: 420
Sum of first 20 Odd Numbers is: 400

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