10
06
Summing Arithmetic Progressions
1. The sum up to the th term of an arithmetic progression with first term and
difference term , may be calculated by:
Program
?→ A:?→ B:?→ C:C(2 A +(C -1)B)÷2→ D:D < 30 STEP >
OUTPUT D: sum of arithmetical progression
Execution Example:
Calculate the sum up to the 10th term of the arithmetic progression with first term 1 and
difference term 3.
1+4+7+・・・+28=145
CA
B
Ak1–()B+()
k 1=
C
∑
AAB+()A 2B+()
…
AC1–()B+()++ ++=
C
2
---- 2AC1–()B+()=
ON
MODE MODE MODE
1
PRGM
MODE
1
COMP
1
P1
Prog
1
S A
D R
P1
P2 P3 P4
G
1
EXE
S A
D R
P1
P2 P3 P4
G
3
EXE
S A
D R
P1
P2 P3 P4
G
1 0
EXE
S A
D R
P1
P2 P3 P4
G
関数電卓事例集 .book 10 ページ 2002年9月2日 月曜日 午後6時51分