Sn=32n – 4n suku ke 11 poin​

Sn=32n-4n

S1=32×1-4×1
S1=32-4
S1=28
U1=28

S2=32n-4n
S2=32×2-4×2
S2=64-8
S2=56

U2=S2-S1
U2=56-28
U2=28

r=U2/U1
r=28/28
r=1

U11=a×r^n-1
U11=28×1^11-1
U11=28×1
U11=28

#LearnWithBrainly.

S1 = 32 -4 = 28 = a
S2 = 64 – 8 = 56
U2 = 56 – 28 = 28
b = 28 – 28 = 0

U11 = a + 10b
U11 = 28 + 0 = 28