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a. U1=a=2
U2=ar=4
2r=4
r=4/2=2
Un=ar pangkat n-1
=2x2 pangkat n-1
=4 pangakt n-1
b. U10= ar⁹
=2x2⁹
=4⁹=262144
c. Sn= a(r pangkat n-1)
S12=2(2¹²⁻1)
=2(2¹¹)
=2(2048)=4096