Question

Jika hasil . Maka nilai n adalah

tolong caranya yg jelas

Answer 1

2^1 +2^2+.......+2^8 = 510
n= 8

a= 2
r = 4/2 = 2

S= 510
Sn = a ( r^n-1) / (r-1)
510 = 2( 2^n - 1) / 1
255 = 2^n - 1
2^n = 256
2^n = 2^8
n = 8

Answer 2

Ini adalah deret geometri

u1 = 2
u2 = 4
u3 = 8

rasio = 2

Sn = 510
Sn = a(r^n - 1) / r - 1
510 = 2(r^n - 1) / 2 - 1
510 = 2r^n - 2
2r^n = 512
r^n = 256
2^n = 256

n = 2log256
n = 2.2^8
n = 8.2log2
n = 8.1
n = 8