Tolong dong, ada yg tau cara ny ga?

23.) U5 = 1/3 ; r=1/3 ; maka U9 =....
Un = ar^(n-1)
U5 = a . 1/3^(4-1)
1/3 = a . 1/3^3
1/3 = a. 1/27
a = 1/3 . 27/1
a = 9
Maka, U9 = ar^8
U9 = 9.1/3^8
U9 = 9 . 1/6561
U9 = 1/729

24.) U7 = 384 ; r = 2 ; U10=...
U7 = ar^6
384 = a . 2^6
384 = a . 64
a = 6
Maka, U10 = ar^9
U10= 6.2^9
U10 = 6. 512 = 3072

25.)
U2=ar=6
U6=ar^5=96
S5=...
U2=ar=6 ----> a=6/r
U6=ar^5=96------> masukkan a= 6/r
96=6/r . r^5
96=6.r^4
16=r^4
r=2-----> a=6/r---> a=6/2=3
S5=a(r^5-1)/r-1
= 3(2^5-1)/2-1
= 3(32-1)/1
= 3.31=93

26.)
U3=ar^2=16 -----> a=16/r^2
U7=ar^6=256-----> masukkan a=16/r^2
256=16/r^2 . r^6
256/16 = r^4
16=r^4
r=2-----> a=16/r^2----> a=16/4=4
S7= a(r^7-1)/r-1
= 4(2^7-1)/2-1
= 4(127)/1=508

maaf kalau ada salah.