Casio fx-3650P Programming Manual page 15

２． The sum of a geometric progression with first term
is:
A + AC + AC
ON MODE MODE
？→ Ａ：？→ Ｂ：？→ Ｃ： （Ａ － ＢＣ）÷（１－ Ｃ）→ Ｄ：Ｄ ＜ 28 STEP ＞
OUTPUT Ｄ: sum of geometric progression
The sum of the geometric progression with first term 1, last term 81 and common ratio 3 is
１＋３＋９＋２７＋８１＝１２１
Prog 1
1 EXE
EXE
8 1
3 EXE
...
2
⁄
+ + B C + B
MODE
A
, last term
A BC –
= ---------------- -
1 C –
PRGM
COMP
1 MODE
S A
S A
S A
S A
B
and common ratio
1 1
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
P1 P1 P2 P3 P4 D R
C
G
G
G
G
13