jumlah 10 suku deret 2+4+8+16+...adalah...

sn = a(1 - r*n) / 1 - r
a = 2, r = 2

s10 = 2(1 - 2*10) / 1-2
s10 = 2(1023) / -1
s10 = 2 x 1023 / -1
s10 = -2046

u1=2
u2=4

s10=....?

a.r^n-1/a.r^n-1 = 8/4
r^2= 4
r=2

s10= a(r^n - 1) / r^n- 1
= 2(2^10-1) /2-1
=2 (1023)
=2046