D=
E=
F=
? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

Answer:
D= 1
E= 4/9
F=16/81
Step-by-step explanation:
(2/3)^x
x=0
x=2
x=4
d= (2/3)^0
e= (2/3)^2
f= (2/3)^4
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