Tolong ya kak…jngn slhpake cara ya…jngn ngambil poinny doang​

Jawaban:

n = 6

u4 =40. —> u1 xr³= 40

u6 = 160 —>u¹x r⁵= 160

u¹x r⁵= 160 per

u1 xr³= 40

r²=4

r = 2√4

r = 2

u1 xr³= 40

u1 x 2³= 40

u1 x 8 = 40

u1 = 40/8

u1 = 5

Sn = n/2(2 U1 + (n-1)r)

Sn = 6/2(2×5+(6-1)2)

Sn = 3(10+10)

Sn = 3×20

Sn = 60