Consider two sequences a = a1, a2, a3, ... and b = b1, b2, b3, ... .
Suppose a is an arithmetic sequence where an = x + (n - 1)d for some
starting term x and difference factor d. Finally, suppose bi - ai =
3 for all i ≥ 1.
i. Show b is also an arithmetic sequence.
ii. Define bn in terms of n, x, and d.