Skip over navigation
Production Equation
Age 16 to 18
Challenge Level 
Taking $X_n$ as the amount of stock at the end of week $n$, you
need to solve the difference equation (recurrence relation)
$$X_{n+1} = X + (1 - {p\over 100})X_n$$ Put $X_n = Y_n - C$ then
choose $C$ such that $$Y_{n+1} = (1 - {p\over 100})Y_n$$ and
consider the values of this expression for $Y_n, Y_{n-1}, Y_{n-2},
... Y_1, Y_0$.
You may also like
Powerful Properties
Yatir from Israel wrote this article on numbers that can be written as $ 2^n-n $ where n is a positive integer.
Poly Fibs
A sequence of polynomials starts 0, 1 and each poly is given by combining the two polys in the sequence just before it. Investigate and prove results about the roots of the polys.