5/16 + 5/8 + 5/4 + 5/2 + 5 + ... + 160 ubahlah kebentuk notasi sigma?

5/16 + 5/8 + 5/4 + ... + 160
= 5 (1/16 + 1/8 + 1/4 + ... + 32)

1/16 + 1/8 + 1/4 + ... + 32
a = 1/16
r = U2/a = 1/8 × 16 = 2

Un = ar^(n - 1)
Un = (1/16)(2^(n - 1)
Un = 2^(n - 5)

32 = 2^(n - 5)
2^5 = 2^(n - 5)
n = 10

Bentuk notasi sigma
10
∑ 5(1/16 + 1/8 + ... + 32)
k = 1
=
10
∑5(2^(n - 5))
n = 1