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A. U1 = a = 3 r = 5
U2 = a.
= 3.
= 15
U3 = 3. Jadi, 4 suku pertama = 3,15,75,375
= 3.25
=75
U4=3.
= 375
B. U2 = 20 r = 4
U2 = a.r
20 = a .4
a = 20/4 = 5 ................................. a = U1 = 5
U3 = 5.4^2 U4= 5.4^3
=5.16 =320
=80
C. Hitung sendiri ya, sekalian belajar :)
Good luck