Question

Ubahlah ke bentuk notasi sigma.
a. 3+7+15+.... (sampai 50 suku)
b. 412+258+128+64+...+ 1/64

Answer 1

1.
a = 3
b = 2
Un = 2n + 1
.
notasi sigma ..
50
∑ (2n + 1)
n = 1
.

2) harusnya 512, 256, 128, 64,....+ 1/64
a = 512
r = 1/2
Un = 2¹⁰⁻ⁿ

1/64 = 2¹⁰⁻ⁿ
2⁻⁶ = 2¹⁰⁻ⁿ
n = 16
.
16
∑ (2)¹⁰⁻ⁿ
n = 1
.