Question

Di ketshui barisan 1/27 1/9 1/3.... hasil penjumlahan suku ke 4 dan suku ke 7 adlh

Answer 1

R = 3
Un = ar pangkat n-1

U₄ + U₇ = (1/27)⁴⁻¹ + (1/27)⁷⁻¹
            = (1/27)³ + (1/27)⁶
            = 1/19.683 + 1/ 387.420.489 
            = (19.683/387.420.489 ) + (1/387.420.489)
            = 19.684/387.420.489 
           
 

Answer 2

Deret geometri
U1 = a = 1/27
r = 3
U4 =a . r^3
U4= 1/27 . 27 = 1

U7 =a . r^6
U7 =1/27 . 3^6
U7 = 1/27 . 729
U7 = 27

U4 + U7 = 28