Assignment:
a) Define the greatest common divisor of two integers.
b) Describe at least three different ways to find the greatest common divisor of two integers.
c) Find the greatest common divisor of 1,234,567 and 7,654,321.
d) Find the greatest common divisor of 2335577911 and 2937557313.
Provide complete and step by step solution for the question and show calculations and use formulas.