Correct Answer: 64
Explanation:
In first circle,
(3)2 = 9
(4)2 = 16
(5)2 = 25
(6)2 = 36.
In second circle,
(6)2 = 36
(7)2 = 49.
In third circle,
(7)2 = 49
(8)2 = 64
(9)2 = 81.
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