Fourth proportional to (a2 - b2), (a2 - ab), (a3 + b3) is

1.	Fourth proportional to (a2 - b2), (a2 - ab), (a3 + b3) is
A.	- b
B.	4 + b4
C.	(a2 - ab + b2)
D.	3 - a2b2 + b2
Answer» D. 3 - a2b2 + b2

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