Create Problem9.py

# Question: Special Pythagorean triplet
# Problem 9
# A Pythagorean triplet is a set of three natural numbers, a < b < c, for which,
# a2 + b2 = c2
# For example, 32 + 42 = 9 + 16 = 25 = 52.
# There exists exactly one Pythagorean triplet for which a + b + c = 1000.
# Find the product abc.
# Answer: a=200, b=375, c=425 Product: 31875000