20021201
Determining the General Term of a Recursion Expression
The following procedure converts the sequence expressed by a recursion expression to the
general term format
a
n
=
f
(
n
).
Example:
To determine the general term of the recursion expression
a
n
+
1
=
a
n
+ 2,
a
1
= 1
u
ClassPad Operation
(1) Start up the Sequence Editor.
• If you have another application running, tap
m
and then
H
.
• If you have the Sequence application running, tap
O
and then [Sequence Editor].
(2) Tap (or press)
O
, [Sequence RUN], [Calc], [rSolve], [
n
,
a
n
], [
a
n
+
1
],
=
, [
n
,
a
n
], [
a
n
],
+
,
2
,
,
, [
a
0
,
a
1
], [
a
1
],
=
,
1
, and then
)
.
(3) Press
E
.
6-3-5
Recursive and Explicit Form of a Sequence
Tip
• For information about the syntax of the “rSolve” function, see “2-7 Using the Action Menu”.
