Recursive Equations A Recursive Equation can be used to write an equation for a sequence. Unlike an Explicit
Equation [t(n) = 4n + 1], a Recursive Equation is written for a sequence in which each term
depends on the
or
before it. To write a recursive equation for a
sequence, at least one term needs to be
and the
, or term 1, of the sequence must be stated at the
of
the equation [t(1) =].

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?