Download Casio fx

Casio fx-3650P
Geometric Series
If the first term and the common ratio of a geometric series are a and R
respectively, then the sum of the first n terms is given by
a( R n  1)
S ( n) 
R 1
Programming Guide
Programming steps
Remarks
Switch to Program Edit
Mode.
1
Select
P1
programming.
1
?
A

A : ?
C
X
2
 C
1
: ?

Store input data a, R, n
in memories A, C, X.
X :
C
for
1
Calculate the sum.
Exit Program Edit Mode
and return to Run Mode.
Running the program
The table below summarizes how you may use the program to solve the following
problem.
● Find the sum of the first 4 terms of an geometric series if its first term is 54 and
its common ratio is
Keying steps
Display
Remarks
A?
1
*
C?
54
1
1
.
3
*
X?
3
*
A(C^X1)(C
4
80
0
Select P1. * stands for the
value stored in memory.
Follow the input prompts of
the calculator.
A = first term.
C = common ratio
X = number of terms
Answer. You can continue
your input for the next
problem by pressing
.
Exit
Further Practice
Now you can try to solve the following questions using the program. Check whether
you can get the correct results.
First Term
Common Ratio
Number of Terms
Input (A;C;X)
Sum
Output
2
3
4
2; 3; 4
80
80
1
1
10
1; 1; 10
0
0
10
2
5
10; 2; 5
310
310