C#

Fibonacci sequence Create a method that takes three integers: a, b, and length. The method will return an array, whose length is defined, with Fibonacci-like sequence of numbers that include and start with a and b. If the length is less than 1, simply return a null. Fibonacci(1, 2, 10) ? { 1, 2, 3, 5, 8, 13, 21, 34, 55, 89 } Fibonacci(10, 20, 5) ? { 10, 20, 30, 50, 80 } Fibonacci(5, 5, 5) ? { 5, 5, 10, 15, 25 } Fibonacci(5, 5, 1) ? { 5 } Fibonacci(5, 5, 0) ? null Fibonacci(5, 5, -1) ? null