Consider the algorithm: Algorithm Input: A natural number n (1) let c := 1 (2) let i : = 0 (3) repeat - (a) let i := i+1 --- (b) let c := c . i (4) until i = n (5) return c What does the algorithm return when the input is n = 2? What does the algorithm return when the input is n = 4? What does the algorithm return when the input is n = 6