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Explanation:

Let the first term be a and the common difference be d.

(a + 6d)2 = (a + 2d) (a + 16d)

⇒ a2 + 12ad + 36d2 = a2 + 18ad + 32d2

⇒ 4d2 = 6ad

⇒ a/d = 2/3

Hence, option (a).

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