6-3-6

Recursive and Explicit Form of a Sequence

Example: To obtain the n-th terms of a system of recursion formulas an+1 = 3an + bn, bn+1 = an + 3bn with the initial conditions a1 =2, b1 = 1

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

SClassPad 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,an], [n], C, , D,, , C,
[n,an], [n], :, , , , [n,an], [n], ,

.

 

 

(3) Press .

Tip

• For information about the syntax of the “3” function, see “2-8 Using the Action Menu”.

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