6-3-6

Recursive and Explicit Form of a Sequence

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 anE = n2 + 2n – 1 in the range of 2 <n <10

u ClassPad Operation

(1)Start up the Sequence Editor.

•If you have another application running, tap mand then H.

•If you have the Sequence application running, tap Oand then [Sequence Editor].

(2)Tap (or press) O, [Sequence RUN], [Calc], [Σ], [n,an], [n], {, 2, +, 2, [n,an], [n], -, 1, ,, [n,an], [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”.

20050501