20021201
Calculating the Sum of a Sequence
Perform the following steps when you want to determine the sum of a specific range of the
sequence of a recursion expression or a general term expression.
Example:
To calculate the sum of the general term expression
a
n
E =
n
2
+ 2
n
– 1 in the
range of 2
<
n
<
10
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], [
Σ
], [
n
,
a
n
], [
n
],
{
,
2
,
+
,
2
, [
n
,
a
n
],
[
n
],
-
,
1
,
,
, [
n
,
a
n
], [
n
],
,
,
2
,
,
,
1
,
0
, and then
)
.
(3) Press
E
.
Tip
• For information about the syntax of the “
Σ
” function, see “2-7 Using the Action Menu”.
6-3-6
Recursive and Explicit Form of a Sequence
20030201
