Casio CLASSPAD 330 3.04 - Manual (Page 375)

20060301
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
S\ ClassPad Operation
(1) Start up the Sequence Editor.
• If you have another application running, tap / and then .
• If you have the Sequence application running, tap and then [Sequence Editor].
(2) Tap (or press) , [Sequence RUN], [Calc], [3], [ n , a
n
], [ n ], C,
, D, , , C,
[ n , a
n
], [ n ], :,
, ,
, [ n , a
n
], [ n ], , .
(3) Press .
Tip
• For information about the syntax of the “ 3” function, see “2-8 Using the Action Menu”.
6-3-6
Recursive and Explicit Form of a Sequence
Example: To obtain the n -th terms of a system of recursion formulas a
n+ 1
= 3 a
n
+ b
n
,
b
n+ 1
= a
n
+ 3 b
n
with the initial conditions a
1
=2, b
1
= 1